90802778090 has 16 divisors (see below), whose sum is σ = 164944497960. Its totient is φ = 35987889600.

The previous prime is 90802778071. The next prime is 90802778117. The reversal of 90802778090 is 9087720809.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 61500528049 + 29302250041 = 247993^2 + 171179^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41651561 + ... + 41653740.

Almost surely, 2^90802778090 is an apocalyptic number.

90802778090 is a deficient number, since it is larger than the sum of its proper divisors (74141719870).

90802778090 is a wasteful number, since it uses less digits than its factorization.

90802778090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83305417.

The product of its (nonzero) digits is 508032, while the sum is 50.

The spelling of 90802778090 in words is "ninety billion, eight hundred two million, seven hundred seventy-eight thousand, ninety".