90128580634 has 4 divisors (see below), whose sum is σ = 135192870954. Its totient is φ = 45064290316.

The previous prime is 90128580623. The next prime is 90128580637. The reversal of 90128580634 is 43608582109.

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

It can be written as a sum of positive squares in only one way, i.e., 79385880025 + 10742700609 = 281755^2 + 103647^2 .

It is a super-2 number, since 2×90128580634² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90128580637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22532145157 + ... + 22532145160.

Almost surely, 2^90128580634 is an apocalyptic number.

90128580634 is a deficient number, since it is larger than the sum of its proper divisors (45064290320).

90128580634 is a wasteful number, since it uses less digits than its factorization.

90128580634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45064290319.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 90128580634 in words is "ninety billion, one hundred twenty-eight million, five hundred eighty thousand, six hundred thirty-four".