86644431 has 32 divisors (see below), whose sum is σ = 133632000. Its totient is φ = 55417824.

The previous prime is 86644429. The next prime is 86644433. The reversal of 86644431 is 13444668.

86644431 is a `hidden beast` number, since 8 + 6 + 644 + 4 + 3 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (86644429) and next prime (86644433).

It is not a de Polignac number, because 86644431 - 2¹ = 86644429 is a prime.

It is a super-2 number, since 2×86644431² = 15014514846627522, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86644433) 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, 186906 + ... + 187368.

It is an arithmetic number, because the mean of its divisors is an integer number (4176000).

Almost surely, 2^86644431 is an apocalyptic number.

86644431 is a deficient number, since it is larger than the sum of its proper divisors (46987569).

86644431 is a wasteful number, since it uses less digits than its factorization.

86644431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 734 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 86644431 is about 9308.2990390296. The cubic root of 86644431 is about 442.5002815281.

The spelling of 86644431 in words is "eighty-six million, six hundred forty-four thousand, four hundred thirty-one".