90143979394 has 16 divisors (see below), whose sum is σ = 157065857856. Its totient is φ = 37999803600.

The previous prime is 90143979377. The next prime is 90143979421. The reversal of 90143979394 is 49397934109.

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, 52776652 + ... + 52778359.

It is an arithmetic number, because the mean of its divisors is an integer number (9816616116).

Almost surely, 2^90143979394 is an apocalyptic number.

90143979394 is a deficient number, since it is larger than the sum of its proper divisors (66921878462).

90143979394 is a wasteful number, since it uses less digits than its factorization.

90143979394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105555081.

The product of its (nonzero) digits is 6613488, while the sum is 58.

The spelling of 90143979394 in words is "ninety billion, one hundred forty-three million, nine hundred seventy-nine thousand, three hundred ninety-four".