91642428 has 30 divisors (see below), whose sum is σ = 239572256. Its totient is φ = 30547368.

The previous prime is 91642409. The next prime is 91642429. The reversal of 91642428 is 82424619.

91642428 is a `hidden beast` number, since 9 + 1 + 642 + 4 + 2 + 8 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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 = 91642392 and 91642401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91642429) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 141100 + ... + 141747.

Almost surely, 2^91642428 is an apocalyptic number.

It is an amenable number.

91642428 is an abundant number, since it is smaller than the sum of its proper divisors (147929828).

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

91642428 is a wasteful number, since it uses less digits than its factorization.

91642428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282863 (or 282852 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 91642428 is about 9573.0051707915. The cubic root of 91642428 is about 450.8501262893.

The spelling of 91642428 in words is "ninety-one million, six hundred forty-two thousand, four hundred twenty-eight".