81026715 has 96 divisors (see below), whose sum is σ = 169302528. Its totient is φ = 32140800.

The previous prime is 81026689. The next prime is 81026717. The reversal of 81026715 is 51762018.

It is not a de Polignac number, because 81026715 - 2⁵ = 81026683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81026717) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1109919 + ... + 1109991.

It is an arithmetic number, because the mean of its divisors is an integer number (1763568).

Almost surely, 2^81026715 is an apocalyptic number.

81026715 is an abundant number, since it is smaller than the sum of its proper divisors (88275813).

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

81026715 is a wasteful number, since it uses less digits than its factorization.

81026715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 81026715 is about 9001.4840443118. The cubic root of 81026715 is about 432.7224333912.

The spelling of 81026715 in words is "eighty-one million, twenty-six thousand, seven hundred fifteen".