38938022640 has 720 divisors, whose sum is σ = 155044326528. Its totient is φ = 8718336000.

The previous prime is 38938022621. The next prime is 38938022659. The reversal of 38938022640 is 4622083983.

38938022640 is a `hidden beast` number, since 3 + 8 + 9 + 380 + 2 + 264 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (38938022621) and next prime (38938022659).

It is a tau number, because it is divible by the number of its divisors (720).

It is a super-2 number, since 2×38938022640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 90343225 + ... + 90343655.

Almost surely, 2^38938022640 is an apocalyptic number.

38938022640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38938022640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77522163264).

38938022640 is an abundant number, since it is smaller than the sum of its proper divisors (116106303888).

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

38938022640 is a wasteful number, since it uses less digits than its factorization.

38938022640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 530 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 38938022640 in words is "thirty-eight billion, nine hundred thirty-eight million, twenty-two thousand, six hundred forty".