91630928 has 10 divisors (see below), whose sum is σ = 177534954. Its totient is φ = 45815456.

The previous prime is 91630897. The next prime is 91630933. The reversal of 91630928 is 82903619.

It can be written as a sum of positive squares in only one way, i.e., 91623184 + 7744 = 9572^2 + 88^2 .

It is a super-2 number, since 2×91630928² = 16792453932282368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91630891 and 91630900.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2863451 + ... + 2863482.

Almost surely, 2^91630928 is an apocalyptic number.

It is an amenable number.

91630928 is a deficient number, since it is larger than the sum of its proper divisors (85904026).

91630928 is a wasteful number, since it uses less digits than its factorization.

91630928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5726941 (or 5726935 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 91630928 is about 9572.4045046164. The cubic root of 91630928 is about 450.8312667812.

The spelling of 91630928 in words is "ninety-one million, six hundred thirty thousand, nine hundred twenty-eight".