3981372528 has 80 divisors (see below), whose sum is σ = 12445989120. Its totient is φ = 1070619648.

The previous prime is 3981372509. The next prime is 3981372539. The reversal of 3981372528 is 8252731893.

It is a happy number.

It is a super-2 number, since 2×3981372528² = 31702654413426221568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342798 + ... + 354221.

It is an arithmetic number, because the mean of its divisors is an integer number (155574864).

Almost surely, 2^3981372528 is an apocalyptic number.

It is an amenable number.

3981372528 is an abundant number, since it is smaller than the sum of its proper divisors (8464616592).

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

3981372528 is a wasteful number, since it uses less digits than its factorization.

3981372528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697054 (or 697048 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 3981372528 is about 63098.1182603729. The cubic root of 3981372528 is about 1584.9331113158.

The spelling of 3981372528 in words is "three billion, nine hundred eighty-one million, three hundred seventy-two thousand, five hundred twenty-eight".