28255780 has 24 divisors (see below), whose sum is σ = 67814208. Its totient is φ = 9687648.

The previous prime is 28255757. The next prime is 28255807. The reversal of 28255780 is 8755282.

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, 100774 + ... + 101053.

It is an arithmetic number, because the mean of its divisors is an integer number (2825592).

Almost surely, 2^28255780 is an apocalyptic number.

28255780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28255780 is an abundant number, since it is smaller than the sum of its proper divisors (39558428).

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

28255780 is a wasteful number, since it uses less digits than its factorization.

28255780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201843 (or 201841 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 28255780 is about 5315.6166152197. The cubic root of 28255780 is about 304.5807371990.

The spelling of 28255780 in words is "twenty-eight million, two hundred fifty-five thousand, seven hundred eighty".