91640379 has 16 divisors (see below), whose sum is σ = 125780000. Its totient is φ = 59304960.

The previous prime is 91640359. The next prime is 91640413. The reversal of 91640379 is 97304619.

It is not a de Polignac number, because 91640379 - 2⁵ = 91640347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91640359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72747 + ... + 73995.

It is an arithmetic number, because the mean of its divisors is an integer number (7861250).

Almost surely, 2^91640379 is an apocalyptic number.

91640379 is a deficient number, since it is larger than the sum of its proper divisors (34139621).

91640379 is a wasteful number, since it uses less digits than its factorization.

91640379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 91640379 is about 9572.8981505080. The cubic root of 91640379 is about 450.8467661325.

The spelling of 91640379 in words is "ninety-one million, six hundred forty thousand, three hundred seventy-nine".