91621028364 has 48 divisors (see below), whose sum is σ = 220747054080. Its totient is φ = 29546003520.

The previous prime is 91621028363. The next prime is 91621028377. The reversal of 91621028364 is 46382012619.

It is not an unprimeable number, because it can be changed into a prime (91621028363) 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, 1218247 + ... + 1291265.

It is an arithmetic number, because the mean of its divisors is an integer number (4598896960).

Almost surely, 2^91621028364 is an apocalyptic number.

It is an amenable number.

91621028364 is an abundant number, since it is smaller than the sum of its proper divisors (129126025716).

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

91621028364 is a wasteful number, since it uses less digits than its factorization.

91621028364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76430 (or 76428 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 91621028364 in words is "ninety-one billion, six hundred twenty-one million, twenty-eight thousand, three hundred sixty-four".