90978158 has 8 divisors (see below), whose sum is σ = 137719560. Its totient is φ = 45071640.

The previous prime is 90978131. The next prime is 90978163. The reversal of 90978158 is 85187909.

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, 208448 + ... + 208883.

It is an arithmetic number, because the mean of its divisors is an integer number (17214945).

Almost surely, 2^90978158 is an apocalyptic number.

90978158 is a deficient number, since it is larger than the sum of its proper divisors (46741402).

90978158 is a wasteful number, since it uses less digits than its factorization.

90978158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417442.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 90978158 is about 9538.2471135948. The cubic root of 90978158 is about 449.7581548212.

The spelling of 90978158 in words is "ninety million, nine hundred seventy-eight thousand, one hundred fifty-eight".