91620424 has 16 divisors (see below), whose sum is σ = 196329600. Its totient is φ = 39265872.

The previous prime is 91620391. The next prime is 91620461. The reversal of 91620424 is 42402619.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 91620392 and 91620401.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817984 + ... + 818095.

It is an arithmetic number, because the mean of its divisors is an integer number (12270600).

Almost surely, 2^91620424 is an apocalyptic number.

It is an amenable number.

91620424 is an abundant number, since it is smaller than the sum of its proper divisors (104709176).

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

91620424 is a wasteful number, since it uses less digits than its factorization.

91620424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636092 (or 1636088 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 91620424 is about 9571.8558284170. The cubic root of 91620424 is about 450.8140392915.

The spelling of 91620424 in words is "ninety-one million, six hundred twenty thousand, four hundred twenty-four".