90312769 has 4 divisors (see below), whose sum is σ = 91189696. Its totient is φ = 89435844.

The previous prime is 90312751. The next prime is 90312773. The reversal of 90312769 is 96721309.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96721309 = 8423 ⋅11483.

It is a cyclic number.

It is not a de Polignac number, because 90312769 - 2⁵ = 90312737 is a prime.

It is a super-2 number, since 2×90312769² = 16312792488894722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90312749) 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, 438309 + ... + 438514.

It is an arithmetic number, because the mean of its divisors is an integer number (22797424).

Almost surely, 2^90312769 is an apocalyptic number.

It is an amenable number.

90312769 is a deficient number, since it is larger than the sum of its proper divisors (876927).

90312769 is a wasteful number, since it uses less digits than its factorization.

90312769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876926.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 90312769 is about 9503.3030573585. The cubic root of 90312769 is about 448.6590020404.

The spelling of 90312769 in words is "ninety million, three hundred twelve thousand, seven hundred sixty-nine".