91621376 has 144 divisors (see below), whose sum is σ = 235282320. Its totient is φ = 35266560.

The previous prime is 91621373. The next prime is 91621379. The reversal of 91621376 is 67312619.

It is an interprime number because it is at equal distance from previous prime (91621373) and next prime (91621379).

It is not an unprimeable number, because it can be changed into a prime (91621373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1103831 + ... + 1103913.

It is an arithmetic number, because the mean of its divisors is an integer number (1633905).

Almost surely, 2^91621376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91621376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117641160).

91621376 is an abundant number, since it is smaller than the sum of its proper divisors (143660944).

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

91621376 is a wasteful number, since it uses less digits than its factorization.

91621376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 103 counting only the distinct ones).

The product of its digits is 13608, while the sum is 35.

The square root of 91621376 is about 9571.9055574112. The cubic root of 91621376 is about 450.8156007101.

The spelling of 91621376 in words is "ninety-one million, six hundred twenty-one thousand, three hundred seventy-six".