90900665438 has 16 divisors (see below), whose sum is σ = 148866835824. Its totient is φ = 41285069760.

The previous prime is 90900665413. The next prime is 90900665467. The reversal of 90900665438 is 83456600909.

It is a congruent number.

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, 1642895 + ... + 1697322.

It is an arithmetic number, because the mean of its divisors is an integer number (9304177239).

Almost surely, 2^90900665438 is an apocalyptic number.

90900665438 is a deficient number, since it is larger than the sum of its proper divisors (57966170386).

90900665438 is a wasteful number, since it uses less digits than its factorization.

90900665438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3341467.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 90900665438 in words is "ninety billion, nine hundred million, six hundred sixty-five thousand, four hundred thirty-eight".