780670638 has 24 divisors (see below), whose sum is σ = 1845221976. Its totient is φ = 236566800.

The previous prime is 780670621. The next prime is 780670699. The reversal of 780670638 is 836076087.

780670638 is a `hidden beast` number, since 7 + 8 + 0 + 6 + 7 + 0 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 780670593 and 780670602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1971193 + ... + 1971588.

It is an arithmetic number, because the mean of its divisors is an integer number (76884249).

Almost surely, 2^780670638 is an apocalyptic number.

780670638 is an abundant number, since it is smaller than the sum of its proper divisors (1064551338).

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

780670638 is a wasteful number, since it uses less digits than its factorization.

780670638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3942800 (or 3942797 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 780670638 is about 27940.4838540781. The cubic root of 780670638 is about 920.7801503205.

The spelling of 780670638 in words is "seven hundred eighty million, six hundred seventy thousand, six hundred thirty-eight".