90172898068 has 24 divisors (see below), whose sum is σ = 172416875904. Its totient is φ = 40923724800.

The previous prime is 90172897993. The next prime is 90172898069. The reversal of 90172898068 is 86089827109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90172898069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1570380 + ... + 1626787.

It is an arithmetic number, because the mean of its divisors is an integer number (7184036496).

Almost surely, 2^90172898068 is an apocalyptic number.

It is an amenable number.

90172898068 is a deficient number, since it is larger than the sum of its proper divisors (82243977836).

90172898068 is a wasteful number, since it uses less digits than its factorization.

90172898068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197823 (or 3197821 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 58.

The spelling of 90172898068 in words is "ninety billion, one hundred seventy-two million, eight hundred ninety-eight thousand, sixty-eight".