3947370864 has 80 divisors (see below), whose sum is σ = 10539992064. Its totient is φ = 1271692800.

The previous prime is 3947370839. The next prime is 3947370901. The reversal of 3947370864 is 4680737493.

It is a happy number.

It is a super-2 number, since 2×3947370864² = 31163473475912212992, which contains 22 as substring.

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, 1729404 + ... + 1731684.

Almost surely, 2^3947370864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3947370864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5269996032).

3947370864 is an abundant number, since it is smaller than the sum of its proper divisors (6592621200).

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

3947370864 is a wasteful number, since it uses less digits than its factorization.

3947370864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486 (or 3480 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 51.

The square root of 3947370864 is about 62828.1056852743. The cubic root of 3947370864 is about 1580.4083311450.

The spelling of 3947370864 in words is "three billion, nine hundred forty-seven million, three hundred seventy thousand, eight hundred sixty-four".