90978418 has 8 divisors (see below), whose sum is σ = 136749312. Its totient is φ = 45395316.

The previous prime is 90978379. The next prime is 90978443. The reversal of 90978418 is 81487909.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45730 + ... + 47677.

It is an arithmetic number, because the mean of its divisors is an integer number (17093664).

Almost surely, 2^90978418 is an apocalyptic number.

90978418 is a deficient number, since it is larger than the sum of its proper divisors (45770894).

90978418 is a wasteful number, since it uses less digits than its factorization.

90978418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93896.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 90978418 is about 9538.2607429237. The cubic root of 90978418 is about 449.7585832647.

The spelling of 90978418 in words is "ninety million, nine hundred seventy-eight thousand, four hundred eighteen".