890998397638 has 16 divisors (see below), whose sum is σ = 1372644849744. Its totient is φ = 433450565280.

The previous prime is 890998397629. The next prime is 890998397683. The reversal of 890998397638 is 836793899098.

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, 6367381 + ... + 6505807.

It is an arithmetic number, because the mean of its divisors is an integer number (85790303109).

Almost surely, 2^890998397638 is an apocalyptic number.

890998397638 is a deficient number, since it is larger than the sum of its proper divisors (481646452106).

890998397638 is a wasteful number, since it uses less digits than its factorization.

890998397638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225447.

The product of its (nonzero) digits is 1269789696, while the sum is 79.

The spelling of 890998397638 in words is "eight hundred ninety billion, nine hundred ninety-eight million, three hundred ninety-seven thousand, six hundred thirty-eight".