28779688 has 16 divisors (see below), whose sum is σ = 61670880. Its totient is φ = 12334128.

The previous prime is 28779679. The next prime is 28779697. The reversal of 28779688 is 88697782.

It is an interprime number because it is at equal distance from previous prime (28779679) and next prime (28779697).

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, 256906 + ... + 257017.

It is an arithmetic number, because the mean of its divisors is an integer number (3854430).

Almost surely, 2^28779688 is an apocalyptic number.

28779688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28779688 is an abundant number, since it is smaller than the sum of its proper divisors (32891192).

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

28779688 is a wasteful number, since it uses less digits than its factorization.

28779688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513936 (or 513932 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 55.

The square root of 28779688 is about 5364.6703533395. The cubic root of 28779688 is about 306.4516945412.

The spelling of 28779688 in words is "twenty-eight million, seven hundred seventy-nine thousand, six hundred eighty-eight".