90988769 has 4 divisors (see below), whose sum is σ = 91705344. Its totient is φ = 90272196.

The previous prime is 90988753. The next prime is 90988819. The reversal of 90988769 is 96788909.

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 90988769 - 2⁴ = 90988753 is a prime.

It is a super-2 number, since 2×90988769² = 16557912168270722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90988669) 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, 358097 + ... + 358350.

It is an arithmetic number, because the mean of its divisors is an integer number (22926336).

Almost surely, 2^90988769 is an apocalyptic number.

It is an amenable number.

90988769 is a deficient number, since it is larger than the sum of its proper divisors (716575).

90988769 is a wasteful number, since it uses less digits than its factorization.

90988769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716574.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 90988769 is about 9538.8033316554. The cubic root of 90988769 is about 449.7756395976.

The spelling of 90988769 in words is "ninety million, nine hundred eighty-eight thousand, seven hundred sixty-nine".