78717630 has 32 divisors (see below), whose sum is σ = 191746944. Its totient is φ = 20677536.

The previous prime is 78717619. The next prime is 78717631. The reversal of 78717630 is 3671787.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78717631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17572 + ... + 21591.

It is an arithmetic number, because the mean of its divisors is an integer number (5992092).

Almost surely, 2^78717630 is an apocalyptic number.

78717630 is an abundant number, since it is smaller than the sum of its proper divisors (113029314).

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

78717630 is a wasteful number, since it uses less digits than its factorization.

78717630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39240.

The product of its (nonzero) digits is 49392, while the sum is 39.

The square root of 78717630 is about 8872.2956443076. The cubic root of 78717630 is about 428.5722068240.

The spelling of 78717630 in words is "seventy-eight million, seven hundred seventeen thousand, six hundred thirty".