91290064 has 10 divisors (see below), whose sum is σ = 176874530. Its totient is φ = 45645024.

The previous prime is 91290047. The next prime is 91290091. The reversal of 91290064 is 46009219.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 57881664 + 33408400 = 7608^2 + 5780^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2852799 + ... + 2852830.

It is an arithmetic number, because the mean of its divisors is an integer number (17687453).

Almost surely, 2^91290064 is an apocalyptic number.

It is an amenable number.

91290064 is a deficient number, since it is larger than the sum of its proper divisors (85584466).

91290064 is a wasteful number, since it uses less digits than its factorization.

91290064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705637 (or 5705631 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 91290064 is about 9554.5834027445. The cubic root of 91290064 is about 450.2715463941.

The spelling of 91290064 in words is "ninety-one million, two hundred ninety thousand, sixty-four".