90840606902 has 4 divisors (see below), whose sum is σ = 136260910356. Its totient is φ = 45420303450.

The previous prime is 90840606881. The next prime is 90840606911. The reversal of 90840606902 is 20960604809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20960604809 = 157 ⋅133507037.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22710151724 + ... + 22710151727.

It is an arithmetic number, because the mean of its divisors is an integer number (34065227589).

Almost surely, 2^90840606902 is an apocalyptic number.

90840606902 is a deficient number, since it is larger than the sum of its proper divisors (45420303454).

90840606902 is a wasteful number, since it uses less digits than its factorization.

90840606902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45420303453.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 90840606902 in words is "ninety billion, eight hundred forty million, six hundred six thousand, nine hundred two".