28555760 has 20 divisors (see below), whose sum is σ = 66392328. Its totient is φ = 11422272.

The previous prime is 28555759. The next prime is 28555763. The reversal of 28555760 is 6755582.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28555763) 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, 178394 + ... + 178553.

Almost surely, 2^28555760 is an apocalyptic number.

28555760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28555760 is an abundant number, since it is smaller than the sum of its proper divisors (37836568).

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

28555760 is a wasteful number, since it uses less digits than its factorization.

28555760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356960 (or 356954 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 38.

The square root of 28555760 is about 5343.7589766006. The cubic root of 28555760 is about 305.6548145966.

The spelling of 28555760 in words is "twenty-eight million, five hundred fifty-five thousand, seven hundred sixty".