3964656840 has 32 divisors (see below), whose sum is σ = 11893970880. Its totient is φ = 1057241792.

The previous prime is 3964656833. The next prime is 3964656841. The reversal of 3964656840 is 486564693.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (3964656841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16519284 + ... + 16519523.

It is an arithmetic number, because the mean of its divisors is an integer number (371686590).

Almost surely, 2^3964656840 is an apocalyptic number.

3964656840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3964656840 is an abundant number, since it is smaller than the sum of its proper divisors (7929314040).

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

3964656840 is a wasteful number, since it uses less digits than its factorization.

3964656840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33038821 (or 33038817 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 51.

The square root of 3964656840 is about 62965.5210412810. The cubic root of 3964656840 is about 1582.7118998286.

The spelling of 3964656840 in words is "three billion, nine hundred sixty-four million, six hundred fifty-six thousand, eight hundred forty".