28090278 has 24 divisors (see below), whose sum is σ = 62826816. Its totient is φ = 9061200.

The previous prime is 28090277. The next prime is 28090301. The reversal of 28090278 is 87209082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28090277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24613 + ... + 25728.

It is an arithmetic number, because the mean of its divisors is an integer number (2617784).

Almost surely, 2^28090278 is an apocalyptic number.

28090278 is an abundant number, since it is smaller than the sum of its proper divisors (34736538).

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

28090278 is a wasteful number, since it uses less digits than its factorization.

28090278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50380 (or 50377 counting only the distinct ones).

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

The square root of 28090278 is about 5300.0262263502. The cubic root of 28090278 is about 303.9849008544.

The spelling of 28090278 in words is "twenty-eight million, ninety thousand, two hundred seventy-eight".