90428944321 has 4 divisors (see below), whose sum is σ = 90466360452. Its totient is φ = 90391528192.

The previous prime is 90428944301. The next prime is 90428944349. The reversal of 90428944321 is 12344982409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12344982409 = 31 ⋅398225239.

It can be written as a sum of positive squares in 2 ways, for example, as 89215118721 + 1213825600 = 298689^2 + 34840^2 .

It is a cyclic number.

It is not a de Polignac number, because 90428944321 - 2²⁹ = 89892073409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90428944301) 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, 18704440 + ... + 18709273.

It is an arithmetic number, because the mean of its divisors is an integer number (22616590113).

Almost surely, 2^90428944321 is an apocalyptic number.

It is an amenable number.

90428944321 is a deficient number, since it is larger than the sum of its proper divisors (37416131).

90428944321 is a wasteful number, since it uses less digits than its factorization.

90428944321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37416130.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 90428944321 in words is "ninety billion, four hundred twenty-eight million, nine hundred forty-four thousand, three hundred twenty-one".