90404644217779 has 8 divisors (see below), whose sum is σ = 93523055582160. Its totient is φ = 87286300176096.

The previous prime is 90404644217759. The next prime is 90404644217861. The reversal of 90404644217779 is 97771244640409.

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

It is a cyclic number.

It is not a de Polignac number, because 90404644217779 - 2²⁵ = 90404610663347 is a prime.

It is a super-2 number, since 2×90404644217779² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90404644217779.

It is not an unprimeable number, because it can be changed into a prime (90404644217729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14091084 + ... + 19477369.

It is an arithmetic number, because the mean of its divisors is an integer number (11690381947770).

Almost surely, 2^{90404644217779} is an apocalyptic number.

90404644217779 is a deficient number, since it is larger than the sum of its proper divisors (3118411364381).

90404644217779 is a wasteful number, since it uses less digits than its factorization.

90404644217779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33661349.

The product of its (nonzero) digits is 85349376, while the sum is 64.

The spelling of 90404644217779 in words is "ninety trillion, four hundred four billion, six hundred forty-four million, two hundred seventeen thousand, seven hundred seventy-nine".