380640864 has 48 divisors (see below), whose sum is σ = 1003641408. Its totient is φ = 126314112.

The previous prime is 380640857. The next prime is 380640877. The reversal of 380640864 is 468046083.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13059 + ... + 30525.

It is an arithmetic number, because the mean of its divisors is an integer number (20909196).

Almost surely, 2^380640864 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 380640864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (501820704).

380640864 is an abundant number, since it is smaller than the sum of its proper divisors (623000544).

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

380640864 is a wasteful number, since it uses less digits than its factorization.

380640864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17707 (or 17699 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 380640864 is about 19510.0195796929. The cubic root of 380640864 is about 724.7225979554.

The spelling of 380640864 in words is "three hundred eighty million, six hundred forty thousand, eight hundred sixty-four".