1662500640 has 96 divisors (see below), whose sum is σ = 5242890240. Its totient is φ = 442824704.

The previous prime is 1662500629. The next prime is 1662500647. The reversal of 1662500640 is 460052661.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1662500598 and 1662500607.

It is not an unprimeable number, because it can be changed into a prime (1662500647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 617377 + ... + 620063.

It is an arithmetic number, because the mean of its divisors is an integer number (54613440).

Almost surely, 2^1662500640 is an apocalyptic number.

1662500640 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 1662500640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2621445120).

1662500640 is an abundant number, since it is smaller than the sum of its proper divisors (3580389600).

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

1662500640 is a wasteful number, since it uses less digits than its factorization.

1662500640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994 (or 3986 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1662500640 is about 40773.7739239330. The cubic root of 1662500640 is about 1184.6424030926.

The spelling of 1662500640 in words is "one billion, six hundred sixty-two million, five hundred thousand, six hundred forty".