90028978 has 16 divisors (see below), whose sum is σ = 145918080. Its totient is φ = 41412816.

The previous prime is 90028949. The next prime is 90028979. The reversal of 90028978 is 87982009.

It is not an unprimeable number, because it can be changed into a prime (90028979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2343 + ... + 13621.

It is an arithmetic number, because the mean of its divisors is an integer number (9119880).

Almost surely, 2^90028978 is an apocalyptic number.

90028978 is a deficient number, since it is larger than the sum of its proper divisors (55889102).

90028978 is a wasteful number, since it uses less digits than its factorization.

90028978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11601.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 90028978 is about 9488.3601322884. The cubic root of 90028978 is about 448.1885665860.

The spelling of 90028978 in words is "ninety million, twenty-eight thousand, nine hundred seventy-eight".