91497764 has 6 divisors (see below), whose sum is σ = 160121094. Its totient is φ = 45748880.

The previous prime is 91497751. The next prime is 91497793. The reversal of 91497764 is 46779419.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 67897600 + 23600164 = 8240^2 + 4858^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11437217 + ... + 11437224.

It is an arithmetic number, because the mean of its divisors is an integer number (26686849).

Almost surely, 2^91497764 is an apocalyptic number.

It is an amenable number.

91497764 is a deficient number, since it is larger than the sum of its proper divisors (68623330).

91497764 is a wasteful number, since it uses less digits than its factorization.

91497764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22874445 (or 22874443 counting only the distinct ones).

The product of its digits is 381024, while the sum is 47.

The square root of 91497764 is about 9565.4463565481. The cubic root of 91497764 is about 450.6127685018.

The spelling of 91497764 in words is "ninety-one million, four hundred ninety-seven thousand, seven hundred sixty-four".