90030978 has 24 divisors (see below), whose sum is σ = 195253500. Its totient is φ = 29981664.

The previous prime is 90030959. The next prime is 90030979. The reversal of 90030978 is 87903009.

It can be written as a sum of positive squares in 2 ways, for example, as 86992929 + 3038049 = 9327^2 + 1743^2 .

It is not an unprimeable number, because it can be changed into a prime (90030979) 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 11 ways as a sum of consecutive naturals, for example, 26268 + ... + 29496.

Almost surely, 2^90030978 is an apocalyptic number.

90030978 is an abundant number, since it is smaller than the sum of its proper divisors (105222522).

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

90030978 is a wasteful number, since it uses less digits than its factorization.

90030978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4786 (or 4783 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 90030978 is about 9488.4655239928. The cubic root of 90030978 is about 448.1918854081.

It can be divided in two parts, 900 and 30978, that added together give a triangular number (31878 = T₂₅₂).

The spelling of 90030978 in words is "ninety million, thirty thousand, nine hundred seventy-eight".