90992647 has 4 divisors (see below), whose sum is σ = 91572376. Its totient is φ = 90412920.

The previous prime is 90992639. The next prime is 90992701. The reversal of 90992647 is 74629909.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74629909 = 6389 ⋅11681.

It is a cyclic number.

It is not a de Polignac number, because 90992647 - 2³ = 90992639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90992597 and 90992606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90998647) 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, 289629 + ... + 289942.

It is an arithmetic number, because the mean of its divisors is an integer number (22893094).

Almost surely, 2^90992647 is an apocalyptic number.

90992647 is a deficient number, since it is larger than the sum of its proper divisors (579729).

90992647 is a wasteful number, since it uses less digits than its factorization.

90992647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579728.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 90992647 is about 9539.0066044636. The cubic root of 90992647 is about 449.7820294161.

The spelling of 90992647 in words is "ninety million, nine hundred ninety-two thousand, six hundred forty-seven".