90856771 has 4 divisors (see below), whose sum is σ = 90901312. Its totient is φ = 90812232.

The previous prime is 90856741. The next prime is 90856813. The reversal of 90856771 is 17765809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17765809 = 37 ⋅480157.

It is a cyclic number.

It is not a de Polignac number, because 90856771 - 2¹⁷ = 90725699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90856741) 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, 19056 + ... + 23341.

It is an arithmetic number, because the mean of its divisors is an integer number (22725328).

Almost surely, 2^90856771 is an apocalyptic number.

90856771 is a deficient number, since it is larger than the sum of its proper divisors (44541).

90856771 is a wasteful number, since it uses less digits than its factorization.

90856771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44540.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 90856771 is about 9531.8818184029. The cubic root of 90856771 is about 449.5580368542.

The spelling of 90856771 in words is "ninety million, eight hundred fifty-six thousand, seven hundred seventy-one".