78713621 has 8 divisors (see below), whose sum is σ = 95250240. Its totient is φ = 63499968.

The previous prime is 78713603. The next prime is 78713623. The reversal of 78713621 is 12631787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-78713621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78713623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330611 + ... + 330848.

It is an arithmetic number, because the mean of its divisors is an integer number (11906280).

Almost surely, 2^78713621 is an apocalyptic number.

It is an amenable number.

78713621 is a deficient number, since it is larger than the sum of its proper divisors (16536619).

78713621 is a wasteful number, since it uses less digits than its factorization.

78713621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661483.

The product of its digits is 14112, while the sum is 35.

The square root of 78713621 is about 8872.0697134321. The cubic root of 78713621 is about 428.5649311343.

The spelling of 78713621 in words is "seventy-eight million, seven hundred thirteen thousand, six hundred twenty-one".