91640940 has 24 divisors (see below), whose sum is σ = 256594800. Its totient is φ = 24437568.

The previous prime is 91640921. The next prime is 91640953. The reversal of 91640940 is 4904619.

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, 763615 + ... + 763734.

It is an arithmetic number, because the mean of its divisors is an integer number (10691450).

Almost surely, 2^91640940 is an apocalyptic number.

It is an amenable number.

91640940 is an abundant number, since it is smaller than the sum of its proper divisors (164953860).

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

91640940 is a wasteful number, since it uses less digits than its factorization.

91640940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527361 (or 1527359 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 91640940 is about 9572.9274519344. The cubic root of 91640940 is about 450.8476861218.

The spelling of 91640940 in words is "ninety-one million, six hundred forty thousand, nine hundred forty".