91374640 has 40 divisors (see below), whose sum is σ = 242796960. Its totient is φ = 31328256.

The previous prime is 91374637. The next prime is 91374659. The reversal of 91374640 is 4647319.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 91374596 and 91374605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81025 + ... + 82144.

It is an arithmetic number, because the mean of its divisors is an integer number (6069924).

Almost surely, 2^91374640 is an apocalyptic number.

It is an amenable number.

91374640 is an abundant number, since it is smaller than the sum of its proper divisors (151422320).

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

91374640 is a wasteful number, since it uses less digits than its factorization.

91374640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163189 (or 163183 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 91374640 is about 9559.0083167659. The cubic root of 91374640 is about 450.4105553590.

The spelling of 91374640 in words is "ninety-one million, three hundred seventy-four thousand, six hundred forty".