91427293640 has 32 divisors (see below), whose sum is σ = 208529381880. Its totient is φ = 36069944832.

The previous prime is 91427293627. The next prime is 91427293651. The reversal of 91427293640 is 4639272419.

It can be written as a sum of positive squares in 4 ways, for example, as 47010045124 + 44417248516 = 216818^2 + 210754^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15652439 + ... + 15658278.

Almost surely, 2^91427293640 is an apocalyptic number.

It is an amenable number.

91427293640 is an abundant number, since it is smaller than the sum of its proper divisors (117102088240).

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

91427293640 is a wasteful number, since it uses less digits than its factorization.

91427293640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31310801 (or 31310797 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 91427293640 in words is "ninety-one billion, four hundred twenty-seven million, two hundred ninety-three thousand, six hundred forty".