91923428 has 6 divisors (see below), whose sum is σ = 160866006. Its totient is φ = 45961712.

The previous prime is 91923427. The next prime is 91923439. The reversal of 91923428 is 82432919.

It can be written as a sum of positive squares in only one way, i.e., 58491904 + 33431524 = 7648^2 + 5782^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91923391 and 91923400.

It is not an unprimeable number, because it can be changed into a prime (91923427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11490425 + ... + 11490432.

It is an arithmetic number, because the mean of its divisors is an integer number (26811001).

Almost surely, 2^91923428 is an apocalyptic number.

It is an amenable number.

91923428 is a deficient number, since it is larger than the sum of its proper divisors (68942578).

91923428 is a wasteful number, since it uses less digits than its factorization.

91923428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22980861 (or 22980859 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 91923428 is about 9587.6706242966. The cubic root of 91923428 is about 451.3104648069.

The spelling of 91923428 in words is "ninety-one million, nine hundred twenty-three thousand, four hundred twenty-eight".