86257731 has 8 divisors (see below), whose sum is σ = 131440384. Its totient is φ = 49290120.

The previous prime is 86257709. The next prime is 86257741. The reversal of 86257731 is 13775268.

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

It is not a de Polignac number, because 86257731 - 2⁹ = 86257219 is a prime.

It is a super-2 number, since 2×86257731² = 14880792314536722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86257731.

It is not an unprimeable number, because it can be changed into a prime (86257741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2053735 + ... + 2053776.

It is an arithmetic number, because the mean of its divisors is an integer number (16430048).

Almost surely, 2^86257731 is an apocalyptic number.

86257731 is a deficient number, since it is larger than the sum of its proper divisors (45182653).

86257731 is a wasteful number, since it uses less digits than its factorization.

86257731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107521.

The product of its digits is 70560, while the sum is 39.

The square root of 86257731 is about 9287.5040242252. The cubic root of 86257731 is about 441.8409967719.

The spelling of 86257731 in words is "eighty-six million, two hundred fifty-seven thousand, seven hundred thirty-one".