90120617 has 8 divisors (see below), whose sum is σ = 93082824. Its totient is φ = 87205248.

The previous prime is 90120577. The next prime is 90120619. The reversal of 90120617 is 71602109.

It can be written as a sum of positive squares in 4 ways, for example, as 4946176 + 85174441 = 2224^2 + 9229^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90120617 - 2⁸ = 90120361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90120619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7778 + ... + 15515.

It is an arithmetic number, because the mean of its divisors is an integer number (11635353).

Almost surely, 2^90120617 is an apocalyptic number.

It is an amenable number.

90120617 is a deficient number, since it is larger than the sum of its proper divisors (2962207).

90120617 is a wasteful number, since it uses less digits than its factorization.

90120617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23419.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 90120617 is about 9493.1879260868. The cubic root of 90120617 is about 448.3405829163.

The spelling of 90120617 in words is "ninety million, one hundred twenty thousand, six hundred seventeen".