28757816 has 8 divisors (see below), whose sum is σ = 53920920. Its totient is φ = 14378904.

The previous prime is 28757809. The next prime is 28757873. The reversal of 28757816 is 61875782.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1797356 + ... + 1797371.

It is an arithmetic number, because the mean of its divisors is an integer number (6740115).

Almost surely, 2^28757816 is an apocalyptic number.

It is an amenable number.

28757816 is a deficient number, since it is larger than the sum of its proper divisors (25163104).

28757816 is a wasteful number, since it uses less digits than its factorization.

28757816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3594733 (or 3594729 counting only the distinct ones).

The product of its digits is 188160, while the sum is 44.

The square root of 28757816 is about 5362.6314436105. The cubic root of 28757816 is about 306.3740424351.

The spelling of 28757816 in words is "twenty-eight million, seven hundred fifty-seven thousand, eight hundred sixteen".