90278920 has 16 divisors (see below), whose sum is σ = 203127660. Its totient is φ = 36111552.

The previous prime is 90278911. The next prime is 90278921. The reversal of 90278920 is 2987209.

It can be written as a sum of positive squares in 2 ways, for example, as 90136036 + 142884 = 9494^2 + 378^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 90278920.

It is not an unprimeable number, because it can be changed into a prime (90278921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1128447 + ... + 1128526.

Almost surely, 2^90278920 is an apocalyptic number.

It is an amenable number.

90278920 is an abundant number, since it is smaller than the sum of its proper divisors (112848740).

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

90278920 is a wasteful number, since it uses less digits than its factorization.

90278920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256984 (or 2256980 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 90278920 is about 9501.5219833456. The cubic root of 90278920 is about 448.6029429455.

The spelling of 90278920 in words is "ninety million, two hundred seventy-eight thousand, nine hundred twenty".