71865090 has 64 divisors (see below), whose sum is σ = 209070720. Its totient is φ = 17421120.

The previous prime is 71865061. The next prime is 71865091. The reversal of 71865090 is 9056817.

71865090 is a `hidden beast` number, since 71 + 86 + 509 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71865091) 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, 9129 + ... + 15068.

It is an arithmetic number, because the mean of its divisors is an integer number (3266730).

Almost surely, 2^71865090 is an apocalyptic number.

71865090 is an abundant number, since it is smaller than the sum of its proper divisors (137205630).

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

71865090 is a wasteful number, since it uses less digits than its factorization.

71865090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24224 (or 24218 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 71865090 is about 8477.3279988449. The cubic root of 71865090 is about 415.7567650137.

The spelling of 71865090 in words is "seventy-one million, eight hundred sixty-five thousand, ninety".