28388760 has 32 divisors (see below), whose sum is σ = 85166640. Its totient is φ = 7570304.

The previous prime is 28388741. The next prime is 28388791. The reversal of 28388760 is 6788382.

It is a congruent number.

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, 118167 + ... + 118406.

Almost surely, 2^28388760 is an apocalyptic number.

28388760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28388760 is an abundant number, since it is smaller than the sum of its proper divisors (56777880).

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

28388760 is a wasteful number, since it uses less digits than its factorization.

28388760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236587 (or 236583 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28388760 is about 5328.1103592174. The cubic root of 28388760 is about 305.0578050431.

The spelling of 28388760 in words is "twenty-eight million, three hundred eighty-eight thousand, seven hundred sixty".