90257978 has 8 divisors (see below), whose sum is σ = 137407872. Its totient is φ = 44455356.

The previous prime is 90257977. The next prime is 90257983. The reversal of 90257978 is 87975209.

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

It is not an unprimeable number, because it can be changed into a prime (90257971) by changing a digit.

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, 336650 + ... + 336917.

It is an arithmetic number, because the mean of its divisors is an integer number (17175984).

Almost surely, 2^90257978 is an apocalyptic number.

90257978 is a deficient number, since it is larger than the sum of its proper divisors (47149894).

90257978 is a wasteful number, since it uses less digits than its factorization.

90257978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673636.

The product of its (nonzero) digits is 317520, while the sum is 47.

The square root of 90257978 is about 9500.4198854577. The cubic root of 90257978 is about 448.5682527899.

The spelling of 90257978 in words is "ninety million, two hundred fifty-seven thousand, nine hundred seventy-eight".