1667647740 has 96 divisors (see below), whose sum is σ = 5120962560. Its totient is φ = 402131200.

The previous prime is 1667647739. The next prime is 1667647741. The reversal of 1667647740 is 477467661.

1667647740 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1667647739) and next prime (1667647741).

It is a self number, because there is not a number n which added to its sum of digits gives 1667647740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667647741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119446 + ... + 132674.

It is an arithmetic number, because the mean of its divisors is an integer number (53343360).

Almost surely, 2^1667647740 is an apocalyptic number.

1667647740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1667647740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2560481280).

1667647740 is an abundant number, since it is smaller than the sum of its proper divisors (3453314820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1667647740 is a wasteful number, since it uses less digits than its factorization.

1667647740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13443 (or 13441 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 48.

The square root of 1667647740 is about 40836.8429240067. The cubic root of 1667647740 is about 1185.8636940760.

The spelling of 1667647740 in words is "one billion, six hundred sixty-seven million, six hundred forty-seven thousand, seven hundred forty".