78251713 has 4 divisors (see below), whose sum is σ = 78271488. Its totient is φ = 78231940.

The previous prime is 78251699. The next prime is 78251717. The reversal of 78251713 is 31715287.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78251713 - 2²⁵ = 44697281 is a prime.

It is a super-2 number, since 2×78251713² = 12246661174868738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78251717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1681 + ... + 12622.

It is an arithmetic number, because the mean of its divisors is an integer number (19567872).

Almost surely, 2^78251713 is an apocalyptic number.

It is an amenable number.

78251713 is a deficient number, since it is larger than the sum of its proper divisors (19775).

78251713 is a wasteful number, since it uses less digits than its factorization.

78251713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19774.

The product of its digits is 11760, while the sum is 34.

The square root of 78251713 is about 8845.9998304318. Note that the first 3 decimals coincide. The cubic root of 78251713 is about 427.7249830887.

The spelling of 78251713 in words is "seventy-eight million, two hundred fifty-one thousand, seven hundred thirteen".