78406680 has 64 divisors (see below), whose sum is σ = 256608000. Its totient is φ = 19007360.

The previous prime is 78406651. The next prime is 78406687. The reversal of 78406680 is 8660487.

It is a super-2 number, since 2×78406680² = 12295214937244800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78406687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28380 + ... + 31019.

It is an arithmetic number, because the mean of its divisors is an integer number (4009500).

Almost surely, 2^78406680 is an apocalyptic number.

It is an amenable number.

78406680 is an abundant number, since it is smaller than the sum of its proper divisors (178201320).

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

78406680 is a wasteful number, since it uses less digits than its factorization.

78406680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59424 (or 59420 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 78406680 is about 8854.7546549862. The cubic root of 78406680 is about 428.0071475209.

The spelling of 78406680 in words is "seventy-eight million, four hundred six thousand, six hundred eighty".