28937028 has 24 divisors (see below), whose sum is σ = 67741632. Its totient is φ = 9613984.

The previous prime is 28937017. The next prime is 28937039. The reversal of 28937028 is 82073982.

28937028 is a nontrivial binomial coefficient, being equal to C(7608, 2).

It is an interprime number because it is at equal distance from previous prime (28937017) and next prime (28937039).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (2822568).

Almost surely, 2^28937028 is an apocalyptic number.

28937028 is the 7607-th triangular number and also the 3804-th hexagonal number.

It is an amenable number.

28937028 is an abundant number, since it is smaller than the sum of its proper divisors (38804604).

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

28937028 is a wasteful number, since it uses less digits than its factorization.

28937028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7931 (or 7929 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 28937028 is about 5379.3148262581. The cubic root of 28937028 is about 307.0091421767.

The spelling of 28937028 in words is "twenty-eight million, nine hundred thirty-seven thousand, twenty-eight".