90539965 has 4 divisors (see below), whose sum is σ = 108647964. Its totient is φ = 72431968.

The previous prime is 90539963. The next prime is 90539989. The reversal of 90539965 is 56993509.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56993509 = 73 ⋅780733.

It can be written as a sum of positive squares in 2 ways, for example, as 47361924 + 43178041 = 6882^2 + 6571^2 .

It is a cyclic number.

It is not a de Polignac number, because 90539965 - 2¹ = 90539963 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90539963) 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, 9053992 + ... + 9054001.

It is an arithmetic number, because the mean of its divisors is an integer number (27161991).

Almost surely, 2^90539965 is an apocalyptic number.

It is an amenable number.

90539965 is a deficient number, since it is larger than the sum of its proper divisors (18107999).

90539965 is a wasteful number, since it uses less digits than its factorization.

90539965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18107998.

The product of its (nonzero) digits is 328050, while the sum is 46.

The square root of 90539965 is about 9515.2490771393. The cubic root of 90539965 is about 449.0349111335.

The spelling of 90539965 in words is "ninety million, five hundred thirty-nine thousand, nine hundred sixty-five".