1640727480 has 128 divisors (see below), whose sum is σ = 5633556480. Its totient is φ = 374476800.

The previous prime is 1640727467. The next prime is 1640727493. The reversal of 1640727480 is 847270461.

It is an interprime number because it is at equal distance from previous prime (1640727467) and next prime (1640727493).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 965992 + ... + 967688.

It is an arithmetic number, because the mean of its divisors is an integer number (44012160).

Almost surely, 2^1640727480 is an apocalyptic number.

1640727480 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 1640727480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2816778240).

1640727480 is an abundant number, since it is smaller than the sum of its proper divisors (3992829000).

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

1640727480 is a wasteful number, since it uses less digits than its factorization.

1640727480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869 (or 2865 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 1640727480 is about 40505.8943858792. The cubic root of 1640727480 is about 1179.4480517376.

The spelling of 1640727480 in words is "one billion, six hundred forty million, seven hundred twenty-seven thousand, four hundred eighty".