91863728190 has 48 divisors (see below), whose sum is σ = 257218442208. Its totient is φ = 22612609728.

The previous prime is 91863728179. The next prime is 91863728191. The reversal of 91863728190 is 9182736819.

91863728190 is a `hidden beast` number, since 9 + 1 + 86 + 372 + 8 + 190 = 666.

It is a super-2 number, since 2×91863728190² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91863728191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39256834 + ... + 39259173.

It is an arithmetic number, because the mean of its divisors is an integer number (5358717546).

Almost surely, 2^91863728190 is an apocalyptic number.

91863728190 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

91863728190 is an abundant number, since it is smaller than the sum of its proper divisors (165354714018).

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

91863728190 is a wasteful number, since it uses less digits than its factorization.

91863728190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78516033 (or 78516030 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 91863728190 in words is "ninety-one billion, eight hundred sixty-three million, seven hundred twenty-eight thousand, one hundred ninety".