90128580637 has 2 divisors, whose sum is σ = 90128580638. Its totient is φ = 90128580636.

The previous prime is 90128580623. The next prime is 90128580653. The reversal of 90128580637 is 73608582109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79755972921 + 10372607716 = 282411^2 + 101846^2 .

It is a cyclic number.

It is not a de Polignac number, because 90128580637 - 2¹⁹ = 90128056349 is a prime.

It is a super-2 number, since 2×90128580637² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90128580037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45064290318 + 45064290319.

It is an arithmetic number, because the mean of its divisors is an integer number (45064290319).

Almost surely, 2^90128580637 is an apocalyptic number.

It is an amenable number.

90128580637 is a deficient number, since it is larger than the sum of its proper divisors (1).

90128580637 is an equidigital number, since it uses as much as digits as its factorization.

90128580637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 90128580637 in words is "ninety billion, one hundred twenty-eight million, five hundred eighty thousand, six hundred thirty-seven".