91647663 has 48 divisors (see below), whose sum is σ = 140152320. Its totient is φ = 53044992.

The previous prime is 91647641. The next prime is 91647667. The reversal of 91647663 is 36674619.

It is not a de Polignac number, because 91647663 - 2¹⁸ = 91385519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91647667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1160058 + ... + 1160136.

It is an arithmetic number, because the mean of its divisors is an integer number (2919840).

Almost surely, 2^91647663 is an apocalyptic number.

91647663 is a deficient number, since it is larger than the sum of its proper divisors (48504657).

91647663 is a wasteful number, since it uses less digits than its factorization.

91647663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 165 counting only the distinct ones).

The product of its digits is 163296, while the sum is 42.

The square root of 91647663 is about 9573.2785919976. The cubic root of 91647663 is about 450.8587109428.

The spelling of 91647663 in words is "ninety-one million, six hundred forty-seven thousand, six hundred sixty-three".