91303820 has 12 divisors (see below), whose sum is σ = 191738064. Its totient is φ = 36521520.

The previous prime is 91303819. The next prime is 91303829. The reversal of 91303820 is 2830319.

It is a self number, because there is not a number n which added to its sum of digits gives 91303820.

It is not an unprimeable number, because it can be changed into a prime (91303829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2282576 + ... + 2282615.

It is an arithmetic number, because the mean of its divisors is an integer number (15978172).

Almost surely, 2^91303820 is an apocalyptic number.

It is an amenable number.

91303820 is an abundant number, since it is smaller than the sum of its proper divisors (100434244).

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

91303820 is a wasteful number, since it uses less digits than its factorization.

91303820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4565200 (or 4565198 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 91303820 is about 9555.3032395628. The cubic root of 91303820 is about 450.2941615764.

The spelling of 91303820 in words is "ninety-one million, three hundred three thousand, eight hundred twenty".