3928531684 has 135 divisors (see below), whose sum is σ = 9041234265. Its totient is φ = 1489229280.

The previous prime is 3928531657. The next prime is 3928531693. The reversal of 3928531684 is 4861358293.

The square root of 3928531684 is 62678.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3515304100 + 413227584 = 59290^2 + 20328^2 .

It is a super-2 number, since 2×3928531684² = 30866722384383751712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 106176514 + ... + 106176550.

Almost surely, 2^3928531684 is an apocalyptic number.

3928531684 is the 62678-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3928531684

3928531684 is an abundant number, since it is smaller than the sum of its proper divisors (5112702581).

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

3928531684 is an equidigital number, since it uses as much as digits as its factorization.

3928531684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 57 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 49.

The cubic root of 3928531684 is about 1577.8901074330.

Multiplying 3928531684 by its sum of digits (49), we get a square (192498052516 = 438746²).

3928531684 divided by its sum of digits (49) gives a square (80174116 = 8954²).

The spelling of 3928531684 in words is "three billion, nine hundred twenty-eight million, five hundred thirty-one thousand, six hundred eighty-four".