91061928 has 64 divisors (see below), whose sum is σ = 267840000. Its totient is φ = 28567296.

The previous prime is 91061923. The next prime is 91061933. The reversal of 91061928 is 82916019.

91061928 is a `hidden beast` number, since 9 + 10 + 619 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (91061923) and next prime (91061933).

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 = 91061892 and 91061901.

It is not an unprimeable number, because it can be changed into a prime (91061923) 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, 8728 + ... + 16071.

It is an arithmetic number, because the mean of its divisors is an integer number (4185000).

Almost surely, 2^91061928 is an apocalyptic number.

It is an amenable number.

91061928 is an abundant number, since it is smaller than the sum of its proper divisors (176778072).

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

91061928 is a wasteful number, since it uses less digits than its factorization.

91061928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24831 (or 24821 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 91061928 is about 9542.6373712931. The cubic root of 91061928 is about 449.8961538151.

The spelling of 91061928 in words is "ninety-one million, sixty-one thousand, nine hundred twenty-eight".