90402679138 has 8 divisors (see below), whose sum is σ = 135691566300. Its totient is φ = 45172157040.

The previous prime is 90402679111. The next prime is 90402679189. The reversal of 90402679138 is 83197620409.

It can be written as a sum of positive squares in 2 ways, for example, as 85131483529 + 5271195609 = 291773^2 + 72603^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 90402679091 and 90402679100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14587393 + ... + 14593588.

Almost surely, 2^90402679138 is an apocalyptic number.

90402679138 is a deficient number, since it is larger than the sum of its proper divisors (45288887162).

90402679138 is a wasteful number, since it uses less digits than its factorization.

90402679138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29182532.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 90402679138 in words is "ninety billion, four hundred two million, six hundred seventy-nine thousand, one hundred thirty-eight".