38720371640 has 32 divisors (see below), whose sum is σ = 92245592880. Its totient is φ = 14577080832.

The previous prime is 38720371561. The next prime is 38720371649. The reversal of 38720371640 is 4617302783.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38720371649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28470182 + ... + 28471541.

Almost surely, 2^38720371640 is an apocalyptic number.

It is an amenable number.

38720371640 is an abundant number, since it is smaller than the sum of its proper divisors (53525221240).

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

38720371640 is a wasteful number, since it uses less digits than its factorization.

38720371640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56941751 (or 56941747 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 38720371640 in words is "thirty-eight billion, seven hundred twenty million, three hundred seventy-one thousand, six hundred forty".