28757788 has 12 divisors (see below), whose sum is σ = 50442840. Its totient is φ = 14345552.

The previous prime is 28757777. The next prime is 28757809. The reversal of 28757788 is 88775782.

It is a happy number.

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, 6343 + ... + 9886.

It is an arithmetic number, because the mean of its divisors is an integer number (4203570).

Almost surely, 2^28757788 is an apocalyptic number.

It is an amenable number.

28757788 is a deficient number, since it is larger than the sum of its proper divisors (21685052).

28757788 is a wasteful number, since it uses less digits than its factorization.

28757788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16676 (or 16674 counting only the distinct ones).

The product of its digits is 1756160, while the sum is 52.

The square root of 28757788 is about 5362.6288329512. The cubic root of 28757788 is about 306.3739430015.

The spelling of 28757788 in words is "twenty-eight million, seven hundred fifty-seven thousand, seven hundred eighty-eight".