90028778 has 24 divisors (see below), whose sum is σ = 157495104. Its totient is φ = 38484600.

The previous prime is 90028769. The next prime is 90028801. The reversal of 90028778 is 87782009.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 47183 + ... + 49053.

It is an arithmetic number, because the mean of its divisors is an integer number (6562296).

Almost surely, 2^90028778 is an apocalyptic number.

90028778 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

90028778 is a deficient number, since it is larger than the sum of its proper divisors (67466326).

90028778 is a wasteful number, since it uses less digits than its factorization.

90028778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378 (or 2371 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 90028778 is about 9488.3495930536. The cubic root of 90028778 is about 448.1882347010.

The spelling of 90028778 in words is "ninety million, twenty-eight thousand, seven hundred seventy-eight".