90164755 has 4 divisors (see below), whose sum is σ = 108197712. Its totient is φ = 72131800.

The previous prime is 90164749. The next prime is 90164773. The reversal of 90164755 is 55746109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55746109 = 853 ⋅65353.

It is a de Polignac number, because none of the positive numbers 2^k-90164755 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9016471 + ... + 9016480.

It is an arithmetic number, because the mean of its divisors is an integer number (27049428).

Almost surely, 2^90164755 is an apocalyptic number.

90164755 is a deficient number, since it is larger than the sum of its proper divisors (18032957).

90164755 is a wasteful number, since it uses less digits than its factorization.

90164755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18032956.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 90164755 is about 9495.5123611104. The cubic root of 90164755 is about 448.4137649382.

It can be divided in two parts, 901 and 64755, that added together give a palindrome (65656).

The spelling of 90164755 in words is "ninety million, one hundred sixty-four thousand, seven hundred fifty-five".