28877980 has 12 divisors (see below), whose sum is σ = 60643800. Its totient is φ = 11551184.

The previous prime is 28877977. The next prime is 28877993. The reversal of 28877980 is 8977882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721930 + ... + 721969.

It is an arithmetic number, because the mean of its divisors is an integer number (5053650).

Almost surely, 2^28877980 is an apocalyptic number.

28877980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28877980 is an abundant number, since it is smaller than the sum of its proper divisors (31765820).

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

28877980 is a wasteful number, since it uses less digits than its factorization.

28877980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443908 (or 1443906 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 28877980 is about 5373.8235921921. The cubic root of 28877980 is about 306.8001755372.

The spelling of 28877980 in words is "twenty-eight million, eight hundred seventy-seven thousand, nine hundred eighty".