91764646 has 4 divisors (see below), whose sum is σ = 137646972. Its totient is φ = 45882322.

The previous prime is 91764643. The next prime is 91764649. The reversal of 91764646 is 64646719.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64646719 = 2837 ⋅22787.

It is an interprime number because it is at equal distance from previous prime (91764643) and next prime (91764649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91764643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22941160 + ... + 22941163.

It is an arithmetic number, because the mean of its divisors is an integer number (34411743).

Almost surely, 2^91764646 is an apocalyptic number.

91764646 is a deficient number, since it is larger than the sum of its proper divisors (45882326).

91764646 is a wasteful number, since it uses less digits than its factorization.

91764646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45882325.

The product of its digits is 217728, while the sum is 43.

The square root of 91764646 is about 9579.3865148035. The cubic root of 91764646 is about 451.0504611657.

The spelling of 91764646 in words is "ninety-one million, seven hundred sixty-four thousand, six hundred forty-six".