1640253650 has 48 divisors (see below), whose sum is σ = 3490967040. Its totient is φ = 561686400.

The previous prime is 1640253613. The next prime is 1640253661. The reversal of 1640253650 is 563520461.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344486 + ... + 349214.

It is an arithmetic number, because the mean of its divisors is an integer number (72728480).

Almost surely, 2^1640253650 is an apocalyptic number.

1640253650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640253650 is an abundant number, since it is smaller than the sum of its proper divisors (1850713390).

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

1640253650 is a wasteful number, since it uses less digits than its factorization.

1640253650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5739 (or 5734 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 1640253650 is about 40500.0450617033. The cubic root of 1640253650 is about 1179.3345021721.

The spelling of 1640253650 in words is "one billion, six hundred forty million, two hundred fifty-three thousand, six hundred fifty".