90697178478 has 32 divisors (see below), whose sum is σ = 194396783616. Its totient is φ = 28136373408.

The previous prime is 90697178443. The next prime is 90697178483. The reversal of 90697178478 is 87487179609.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8876326 + ... + 8886537.

It is an arithmetic number, because the mean of its divisors is an integer number (6074899488).

Almost surely, 2^90697178478 is an apocalyptic number.

90697178478 is an abundant number, since it is smaller than the sum of its proper divisors (103699605138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90697178478 is a wasteful number, since it uses less digits than its factorization.

90697178478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17762928.

The product of its (nonzero) digits is 42674688, while the sum is 66.

The spelling of 90697178478 in words is "ninety billion, six hundred ninety-seven million, one hundred seventy-eight thousand, four hundred seventy-eight".