90280878 has 8 divisors (see below), whose sum is σ = 180561768. Its totient is φ = 30093624.

The previous prime is 90280873. The next prime is 90280909. The reversal of 90280878 is 87808209.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

90280878 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90280873) 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, 7523401 + ... + 7523412.

It is an arithmetic number, because the mean of its divisors is an integer number (22570221).

Almost surely, 2^90280878 is an apocalyptic number.

90280878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

90280878 is a wasteful number, since it uses less digits than its factorization.

90280878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15046818.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 90280878 is about 9501.6250189112. The cubic root of 90280878 is about 448.6061860732.

The spelling of 90280878 in words is "ninety million, two hundred eighty thousand, eight hundred seventy-eight".