28918280 has 32 divisors (see below), whose sum is σ = 65707200. Its totient is φ = 11453376.

The previous prime is 28918277. The next prime is 28918333. The reversal of 28918280 is 8281982.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611 + ... + 7629.

It is an arithmetic number, because the mean of its divisors is an integer number (2053350).

Almost surely, 2^28918280 is an apocalyptic number.

28918280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28918280 is an abundant number, since it is smaller than the sum of its proper divisors (36788920).

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

28918280 is a wasteful number, since it uses less digits than its factorization.

28918280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7133 (or 7129 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 28918280 is about 5377.5719428010. The cubic root of 28918280 is about 306.9428251740.

The spelling of 28918280 in words is "twenty-eight million, nine hundred eighteen thousand, two hundred eighty".