1640690372 has 48 divisors (see below), whose sum is σ = 3059804160. Its totient is φ = 768131232.

The previous prime is 1640690369. The next prime is 1640690377. The reversal of 1640690372 is 2730960461.

It is not an unprimeable number, because it can be changed into a prime (1640690377) 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, 1102613 + ... + 1104099.

It is an arithmetic number, because the mean of its divisors is an integer number (63745920).

Almost surely, 2^1640690372 is an apocalyptic number.

It is an amenable number.

1640690372 is a deficient number, since it is larger than the sum of its proper divisors (1419113788).

1640690372 is a wasteful number, since it uses less digits than its factorization.

1640690372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760 (or 1758 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 1640690372 is about 40505.4363264982. The cubic root of 1640690372 is about 1179.4391598916.

The spelling of 1640690372 in words is "one billion, six hundred forty million, six hundred ninety thousand, three hundred seventy-two".