90642704586890 has 8 divisors (see below), whose sum is σ = 163156868256420. Its totient is φ = 36257081834752.

The previous prime is 90642704586877. The next prime is 90642704586899. The reversal of 90642704586890 is 9868540724609.

It can be written as a sum of positive squares in 2 ways, for example, as 79469041240681 + 11173663346209 = 8914541^2 + 3342703^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 90642704586890.

It is not an unprimeable number, because it can be changed into a prime (90642704586899) 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, 4532135229335 + ... + 4532135229354.

Almost surely, 2^{90642704586890} is an apocalyptic number.

90642704586890 is a deficient number, since it is larger than the sum of its proper divisors (72514163669530).

90642704586890 is a wasteful number, since it uses less digits than its factorization.

90642704586890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9064270458696.

The product of its (nonzero) digits is 209018880, while the sum is 68.

The spelling of 90642704586890 in words is "ninety trillion, six hundred forty-two billion, seven hundred four million, five hundred eighty-six thousand, eight hundred ninety".