91163620 has 24 divisors (see below), whose sum is σ = 192669624. Its totient is φ = 36231936.

The previous prime is 91163609. The next prime is 91163621. The reversal of 91163620 is 2636119.

It can be written as a sum of positive squares in 4 ways, for example, as 1747684 + 89415936 = 1322^2 + 9456^2 .

It is a super-2 number, since 2×91163620² = 16621611223008800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91163621) 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, 11377 + ... + 17656.

It is an arithmetic number, because the mean of its divisors is an integer number (8027901).

Almost surely, 2^91163620 is an apocalyptic number.

It is an amenable number.

91163620 is an abundant number, since it is smaller than the sum of its proper divisors (101506004).

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

91163620 is a wasteful number, since it uses less digits than its factorization.

91163620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29199 (or 29197 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 91163620 is about 9547.9641809131. The cubic root of 91163620 is about 450.0635630377.

Adding to 91163620 its reverse (2636119), we get a palindrome (93799739).

The spelling of 91163620 in words is "ninety-one million, one hundred sixty-three thousand, six hundred twenty".