78725731 has 8 divisors (see below), whose sum is σ = 90430560. Its totient is φ = 67135488.

The previous prime is 78725701. The next prime is 78725741. The reversal of 78725731 is 13752787.

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

It is not a de Polignac number, because 78725731 - 2⁹ = 78725219 is a prime.

It is a super-2 number, since 2×78725731² = 12395481442968722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78725701) 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, 27166 + ... + 29923.

It is an arithmetic number, because the mean of its divisors is an integer number (11303820).

Almost surely, 2^78725731 is an apocalyptic number.

78725731 is a deficient number, since it is larger than the sum of its proper divisors (11704829).

78725731 is a wasteful number, since it uses less digits than its factorization.

78725731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57293.

The product of its digits is 82320, while the sum is 40.

The square root of 78725731 is about 8872.7521660418. The cubic root of 78725731 is about 428.5869080811.

The spelling of 78725731 in words is "seventy-eight million, seven hundred twenty-five thousand, seven hundred thirty-one".