28683780 has 24 divisors (see below), whose sum is σ = 80314752. Its totient is φ = 7648992.

The previous prime is 28683779. The next prime is 28683793. The reversal of 28683780 is 8738682.

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, 238972 + ... + 239091.

It is an arithmetic number, because the mean of its divisors is an integer number (3346448).

Almost surely, 2^28683780 is an apocalyptic number.

28683780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28683780 is an abundant number, since it is smaller than the sum of its proper divisors (51630972).

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

28683780 is a wasteful number, since it uses less digits than its factorization.

28683780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478075 (or 478073 counting only the distinct ones).

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

The square root of 28683780 is about 5355.7240406877. The cubic root of 28683780 is about 306.1109000396.

The spelling of 28683780 in words is "twenty-eight million, six hundred eighty-three thousand, seven hundred eighty".