90642617 has 4 divisors (see below), whose sum is σ = 97615140. Its totient is φ = 83670096.

The previous prime is 90642613. The next prime is 90642619. The reversal of 90642617 is 71624609.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21353641 + 69288976 = 4621^2 + 8324^2 .

It is a cyclic number.

It is not a de Polignac number, because 90642617 - 2² = 90642613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90642613) 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, 3486242 + ... + 3486267.

It is an arithmetic number, because the mean of its divisors is an integer number (24403785).

Almost surely, 2^90642617 is an apocalyptic number.

It is an amenable number.

90642617 is a deficient number, since it is larger than the sum of its proper divisors (6972523).

90642617 is a wasteful number, since it uses less digits than its factorization.

90642617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6972522.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 90642617 is about 9520.6416275375. The cubic root of 90642617 is about 449.2045486427.

The spelling of 90642617 in words is "ninety million, six hundred forty-two thousand, six hundred seventeen".