90120973 has 4 divisors (see below), whose sum is σ = 91598428. Its totient is φ = 88643520.

The previous prime is 90120967. The next prime is 90120997. The reversal of 90120973 is 37902109.

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 34140649 + 55980324 = 5843^2 + 7482^2 .

It is a cyclic number.

It is not a de Polignac number, because 90120973 - 2⁵ = 90120941 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 (90120913) 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, 738636 + ... + 738757.

It is an arithmetic number, because the mean of its divisors is an integer number (22899607).

Almost surely, 2^90120973 is an apocalyptic number.

It is an amenable number.

90120973 is a deficient number, since it is larger than the sum of its proper divisors (1477455).

90120973 is a wasteful number, since it uses less digits than its factorization.

90120973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477454.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 90120973 is about 9493.2066763555. The cubic root of 90120973 is about 448.3411732697.

The spelling of 90120973 in words is "ninety million, one hundred twenty thousand, nine hundred seventy-three".