90856577 has 4 divisors (see below), whose sum is σ = 103836096. Its totient is φ = 77877060.

The previous prime is 90856559. The next prime is 90856607. The reversal of 90856577 is 77565809.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90856577 - 2¹⁰ = 90855553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90856477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6489749 + ... + 6489762.

It is an arithmetic number, because the mean of its divisors is an integer number (25959024).

Almost surely, 2^90856577 is an apocalyptic number.

It is an amenable number.

90856577 is a deficient number, since it is larger than the sum of its proper divisors (12979519).

90856577 is a wasteful number, since it uses less digits than its factorization.

90856577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12979518.

The product of its (nonzero) digits is 529200, while the sum is 47.

The square root of 90856577 is about 9531.8716420229. The cubic root of 90856577 is about 449.5577168842.

The spelling of 90856577 in words is "ninety million, eight hundred fifty-six thousand, five hundred seventy-seven".