19640710944 has 72 divisors (see below), whose sum is σ = 55867151340. Its totient is φ = 6545276928.

The previous prime is 19640710939. The next prime is 19640710961. The reversal of 19640710944 is 44901704691.

19640710944 is a `hidden beast` number, since 196 + 407 + 10 + 9 + 44 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19547395344 + 93315600 = 139812^2 + 9660^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×19640710944² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19640710944.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1888992 + ... + 1899360.

Almost surely, 2^19640710944 is an apocalyptic number.

It is an amenable number.

19640710944 is an abundant number, since it is smaller than the sum of its proper divisors (36226440396).

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

19640710944 is a wasteful number, since it uses less digits than its factorization.

19640710944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16962 (or 16951 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 19640710944 in words is "nineteen billion, six hundred forty million, seven hundred ten thousand, nine hundred forty-four".