91761228 has 48 divisors (see below), whose sum is σ = 256203360. Its totient is φ = 28233792.

The previous prime is 91761217. The next prime is 91761253. The reversal of 91761228 is 82216719.

91761228 is a `hidden beast` number, since 9 + 17 + 612 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 91761192 and 91761201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31275 + ... + 34082.

It is an arithmetic number, because the mean of its divisors is an integer number (5337570).

Almost surely, 2^91761228 is an apocalyptic number.

It is an amenable number.

91761228 is an abundant number, since it is smaller than the sum of its proper divisors (164442132).

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

91761228 is a wasteful number, since it uses less digits than its factorization.

91761228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65383 (or 65375 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 91761228 is about 9579.2081092332. The cubic root of 91761228 is about 451.0448609348.

It can be divided in two parts, 9176 and 1228, that added together give a square (10404 = 102²).

The spelling of 91761228 in words is "ninety-one million, seven hundred sixty-one thousand, two hundred twenty-eight".