90213231208 has 16 divisors (see below), whose sum is σ = 169162519680. Its totient is φ = 45103225968.

The previous prime is 90213231137. The next prime is 90213231217. The reversal of 90213231208 is 80213231209.

It is a super-3 number, since 3×90213231208³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90213231208.

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, 308760 + ... + 525127.

It is an arithmetic number, because the mean of its divisors is an integer number (10572657480).

Almost surely, 2^90213231208 is an apocalyptic number.

It is an amenable number.

90213231208 is a deficient number, since it is larger than the sum of its proper divisors (78949288472).

90213231208 is a wasteful number, since it uses less digits than its factorization.

90213231208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847416 (or 847412 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

Subtracting from 90213231208 its reverse (80213231209), we obtain a palindrome (9999999999).

The spelling of 90213231208 in words is "ninety billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred eight".