1640932728 has 32 divisors (see below), whose sum is σ = 4105253760. Its totient is φ = 546588000.

The previous prime is 1640932697. The next prime is 1640932751. The reversal of 1640932728 is 8272390461.

It is a self number, because there is not a number n which added to its sum of digits gives 1640932728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11103 + ... + 58353.

It is an arithmetic number, because the mean of its divisors is an integer number (128289180).

Almost surely, 2^1640932728 is an apocalyptic number.

It is an amenable number.

1640932728 is an abundant number, since it is smaller than the sum of its proper divisors (2464321032).

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

1640932728 is a wasteful number, since it uses less digits than its factorization.

1640932728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48707 (or 48703 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 1640932728 is about 40508.4278638409. The cubic root of 1640932728 is about 1179.4972309915.

The spelling of 1640932728 in words is "one billion, six hundred forty million, nine hundred thirty-two thousand, seven hundred twenty-eight".