90667565 has 4 divisors (see below), whose sum is σ = 108801084. Its totient is φ = 72534048.

The previous prime is 90667561. The next prime is 90667571. The reversal of 90667565 is 56576609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56576609 = 67 ⋅844427.

It can be written as a sum of positive squares in 2 ways, for example, as 14122564 + 76545001 = 3758^2 + 8749^2 .

It is a cyclic number.

It is not a de Polignac number, because 90667565 - 2² = 90667561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90667561) 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, 9066752 + ... + 9066761.

It is an arithmetic number, because the mean of its divisors is an integer number (27200271).

Almost surely, 2^90667565 is an apocalyptic number.

It is an amenable number.

90667565 is a deficient number, since it is larger than the sum of its proper divisors (18133519).

90667565 is a wasteful number, since it uses less digits than its factorization.

90667565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18133518.

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 90667565 is about 9521.9517432090. The cubic root of 90667565 is about 449.2457570994.

The spelling of 90667565 in words is "ninety million, six hundred sixty-seven thousand, five hundred sixty-five".