28898728 has 8 divisors (see below), whose sum is σ = 54185130. Its totient is φ = 14449360.

The previous prime is 28898711. The next prime is 28898743. The reversal of 28898728 is 82789882.

It can be written as a sum of positive squares in only one way, i.e., 16662724 + 12236004 = 4082^2 + 3498^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1806163 + ... + 1806178.

Almost surely, 2^28898728 is an apocalyptic number.

It is an amenable number.

28898728 is a deficient number, since it is larger than the sum of its proper divisors (25286402).

28898728 is a wasteful number, since it uses less digits than its factorization.

28898728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612347 (or 3612343 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The square root of 28898728 is about 5375.7537145967. The cubic root of 28898728 is about 306.8736336551.

The spelling of 28898728 in words is "twenty-eight million, eight hundred ninety-eight thousand, seven hundred twenty-eight".