90922978178 has 6 divisors (see below), whose sum is σ = 136385106921. Its totient is φ = 45461275872.

The previous prime is 90922978171. The next prime is 90922978199. The reversal of 90922978178 is 87187922909.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 46853632849 + 44069345329 = 216457^2 + 209927^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=213217.

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 90922978178.

It is not an unprimeable number, because it can be changed into a prime (90922978171) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 319826 + ... + 533042.

Almost surely, 2^90922978178 is an apocalyptic number.

90922978178 is a deficient number, since it is larger than the sum of its proper divisors (45462128743).

90922978178 is an frugal number, since it uses more digits than its factorization.

90922978178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426436 (or 213219 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 62.

The spelling of 90922978178 in words is "ninety billion, nine hundred twenty-two million, nine hundred seventy-eight thousand, one hundred seventy-eight".