91860858 has 32 divisors (see below), whose sum is σ = 214881600. Its totient is φ = 29008368.

The previous prime is 91860851. The next prime is 91860871. The reversal of 91860858 is 85806819.

It is not an unprimeable number, because it can be changed into a prime (91860851) 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, 43741 + ... + 45792.

It is an arithmetic number, because the mean of its divisors is an integer number (6715050).

Almost surely, 2^91860858 is an apocalyptic number.

91860858 is an abundant number, since it is smaller than the sum of its proper divisors (123020742).

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

91860858 is a wasteful number, since it uses less digits than its factorization.

91860858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89563 (or 89557 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 91860858 is about 9584.4070239113. The cubic root of 91860858 is about 451.2080429474.

It can be divided in two parts, 918 and 60858, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 91860858 in words is "ninety-one million, eight hundred sixty thousand, eight hundred fifty-eight".