91640398632 has 32 divisors (see below), whose sum is σ = 229137439680. Its totient is φ = 30541940480.

The previous prime is 91640398631. The next prime is 91640398643. The reversal of 91640398632 is 23689304619.

It is a super-2 number, since 2×91640398632² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91640398631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148044 + ... + 452987.

It is an arithmetic number, because the mean of its divisors is an integer number (7160544990).

Almost surely, 2^91640398632 is an apocalyptic number.

It is an amenable number.

91640398632 is an abundant number, since it is smaller than the sum of its proper divisors (137497041048).

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

91640398632 is a wasteful number, since it uses less digits than its factorization.

91640398632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607393 (or 607389 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 51.

The spelling of 91640398632 in words is "ninety-one billion, six hundred forty million, three hundred ninety-eight thousand, six hundred thirty-two".