90108190820 has 12 divisors (see below), whose sum is σ = 189227200764. Its totient is φ = 36043276320.

The previous prime is 90108190801. The next prime is 90108190831. The reversal of 90108190820 is 2809180109.

It can be written as a sum of positive squares in 2 ways, for example, as 26050605604 + 64057585216 = 161402^2 + 253096^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2252704751 + ... + 2252704790.

It is an arithmetic number, because the mean of its divisors is an integer number (15768933397).

Almost surely, 2^90108190820 is an apocalyptic number.

It is an amenable number.

90108190820 is an abundant number, since it is smaller than the sum of its proper divisors (99119009944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90108190820 is a wasteful number, since it uses less digits than its factorization.

90108190820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505409550 (or 4505409548 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 38.

The spelling of 90108190820 in words is "ninety billion, one hundred eight million, one hundred ninety thousand, eight hundred twenty".