28655788 has 18 divisors (see below), whose sum is σ = 58335396. Its totient is φ = 12280968.

The previous prime is 28655779. The next prime is 28655789. The reversal of 28655788 is 88755682.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (28655789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72906 + ... + 73297.

Almost surely, 2^28655788 is an apocalyptic number.

28655788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28655788 is an abundant number, since it is smaller than the sum of its proper divisors (29679608).

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

28655788 is a wasteful number, since it uses less digits than its factorization.

28655788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146221 (or 146212 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 49.

The square root of 28655788 is about 5353.1101240307. The cubic root of 28655788 is about 306.0112915366.

The spelling of 28655788 in words is "twenty-eight million, six hundred fifty-five thousand, seven hundred eighty-eight".