90729339638 has 16 divisors (see below), whose sum is σ = 163722117120. Its totient is φ = 36837476136.

The previous prime is 90729339611. The next prime is 90729339641. The reversal of 90729339638 is 83693392709.

It is a super-2 number, since 2×90729339638² (a number of 23 digits) contains 22 as substring.

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, 170543606 + ... + 170544137.

It is an arithmetic number, because the mean of its divisors is an integer number (10232632320).

Almost surely, 2^90729339638 is an apocalyptic number.

90729339638 is a deficient number, since it is larger than the sum of its proper divisors (72992777482).

90729339638 is a wasteful number, since it uses less digits than its factorization.

90729339638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341087771.

The product of its (nonzero) digits is 13226976, while the sum is 59.

The spelling of 90729339638 in words is "ninety billion, seven hundred twenty-nine million, three hundred thirty-nine thousand, six hundred thirty-eight".