91619772 has 24 divisors (see below), whose sum is σ = 214018896. Its totient is φ = 30505728.

The previous prime is 91619771. The next prime is 91619777. The reversal of 91619772 is 27791619.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91619771) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 8388 + ... + 15924.

It is an arithmetic number, because the mean of its divisors is an integer number (8917454).

Almost surely, 2^91619772 is an apocalyptic number.

It is an amenable number.

91619772 is an abundant number, since it is smaller than the sum of its proper divisors (122399124).

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

91619772 is a wasteful number, since it uses less digits than its factorization.

91619772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8557 (or 8555 counting only the distinct ones).

The product of its digits is 47628, while the sum is 42.

The square root of 91619772 is about 9571.8217701752. The cubic root of 91619772 is about 450.8129699104.

The spelling of 91619772 in words is "ninety-one million, six hundred nineteen thousand, seven hundred seventy-two".