90138479012 has 12 divisors (see below), whose sum is σ = 157807083420. Its totient is φ = 45050740896.

The previous prime is 90138479009. The next prime is 90138479017. The reversal of 90138479012 is 21097483109.

It can be written as a sum of positive squares in 2 ways, for example, as 51845468416 + 38293010596 = 227696^2 + 195686^2 .

It is a super-2 number, since 2×90138479012² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90138479017) by changing a digit.

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, 4613687 + ... + 4633182.

It is an arithmetic number, because the mean of its divisors is an integer number (13150590285).

Almost surely, 2^90138479012 is an apocalyptic number.

It is an amenable number.

90138479012 is a deficient number, since it is larger than the sum of its proper divisors (67668604408).

90138479012 is a wasteful number, since it uses less digits than its factorization.

90138479012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9249310 (or 9249308 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 90138479012 in words is "ninety billion, one hundred thirty-eight million, four hundred seventy-nine thousand, twelve".