81700086 has 32 divisors (see below), whose sum is σ = 180069120. Its totient is φ = 24552864.

The previous prime is 81700081. The next prime is 81700111. The reversal of 81700086 is 68000718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81700081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8826 + ... + 15533.

It is an arithmetic number, because the mean of its divisors is an integer number (5627160).

Almost surely, 2^81700086 is an apocalyptic number.

81700086 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

81700086 is an abundant number, since it is smaller than the sum of its proper divisors (98369034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81700086 is a wasteful number, since it uses less digits than its factorization.

81700086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24420.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 81700086 is about 9038.8099880460. The cubic root of 81700086 is about 433.9178385812.

The spelling of 81700086 in words is "eighty-one million, seven hundred thousand, eighty-six".