91859490 has 48 divisors (see below), whose sum is σ = 251409600. Its totient is φ = 23206176.

The previous prime is 91859437. The next prime is 91859497. The reversal of 91859490 is 9495819.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (91859497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25150 + ... + 28569.

It is an arithmetic number, because the mean of its divisors is an integer number (5237700).

Almost surely, 2^91859490 is an apocalyptic number.

91859490 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

91859490 is an abundant number, since it is smaller than the sum of its proper divisors (159550110).

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

91859490 is a wasteful number, since it uses less digits than its factorization.

91859490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53751 (or 53748 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 91859490 is about 9584.3356577282. The cubic root of 91859490 is about 451.2058031263.

The spelling of 91859490 in words is "ninety-one million, eight hundred fifty-nine thousand, four hundred ninety".