90121963678 has 8 divisors (see below), whose sum is σ = 135184249368. Its totient is φ = 45060547224.

The previous prime is 90121963667. The next prime is 90121963717. The reversal of 90121963678 is 87636912109.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209725 + ... + 473527.

It is an arithmetic number, because the mean of its divisors is an integer number (16898031171).

Almost surely, 2^90121963678 is an apocalyptic number.

90121963678 is a deficient number, since it is larger than the sum of its proper divisors (45062285690).

90121963678 is a wasteful number, since it uses less digits than its factorization.

90121963678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434618.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 90121963678 in words is "ninety billion, one hundred twenty-one million, nine hundred sixty-three thousand, six hundred seventy-eight".