90780228 has 72 divisors (see below), whose sum is σ = 286104000. Its totient is φ = 23578560.

The previous prime is 90780211. The next prime is 90780229. The reversal of 90780228 is 82208709.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 90780192 and 90780201.

It is not an unprimeable number, because it can be changed into a prime (90780229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13603 + ... + 19146.

Almost surely, 2^90780228 is an apocalyptic number.

It is an amenable number.

90780228 is an abundant number, since it is smaller than the sum of its proper divisors (195323772).

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

90780228 is a wasteful number, since it uses less digits than its factorization.

90780228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32777 (or 32772 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 90780228 is about 9527.8658680735. The cubic root of 90780228 is about 449.4317568199.

The spelling of 90780228 in words is "ninety million, seven hundred eighty thousand, two hundred twenty-eight".