38640870 has 96 divisors (see below), whose sum is σ = 107827200. Its totient is φ = 9571392.

The previous prime is 38640857. The next prime is 38640907. The reversal of 38640870 is 7804683.

38640870 is a `hidden beast` number, since 3 + 8 + 640 + 8 + 7 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100699 + ... + 101081.

It is an arithmetic number, because the mean of its divisors is an integer number (1123200).

Almost surely, 2^38640870 is an apocalyptic number.

38640870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 38640870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53913600).

38640870 is an abundant number, since it is smaller than the sum of its proper divisors (69186330).

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

38640870 is a wasteful number, since it uses less digits than its factorization.

38640870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 38640870 is about 6216.1780862520. The cubic root of 38640870 is about 338.0770047349.

The spelling of 38640870 in words is "thirty-eight million, six hundred forty thousand, eight hundred seventy".