86663731 has 32 divisors (see below), whose sum is σ = 116881920. Its totient is φ = 62208000.

The previous prime is 86663729. The next prime is 86663749. The reversal of 86663731 is 13736668.

It is a 11-Lehmer number, since φ(86663731) divides (86663731-1)¹¹.

It is a cyclic number.

It is not a de Polignac number, because 86663731 - 2¹ = 86663729 is a prime.

It is a super-2 number, since 2×86663731² = 15021204541680722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86663771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53331 + ... + 54931.

It is an arithmetic number, because the mean of its divisors is an integer number (3652560).

Almost surely, 2^86663731 is an apocalyptic number.

86663731 is a deficient number, since it is larger than the sum of its proper divisors (30218189).

86663731 is a wasteful number, since it uses less digits than its factorization.

86663731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675.

The product of its digits is 108864, while the sum is 40.

The square root of 86663731 is about 9309.3356905850. The cubic root of 86663731 is about 442.5331346548.

It can be divided in two parts, 866637 and 31, that added together give a palindrome (866668).

The spelling of 86663731 in words is "eighty-six million, six hundred sixty-three thousand, seven hundred thirty-one".