28966728 has 32 divisors (see below), whose sum is σ = 82762560. Its totient is φ = 8276160.

The previous prime is 28966723. The next prime is 28966733. The reversal of 28966728 is 82766982.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28966723) and next prime (28966733).

It is not an unprimeable number, because it can be changed into a prime (28966723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86043 + ... + 86378.

It is an arithmetic number, because the mean of its divisors is an integer number (2586330).

Almost surely, 2^28966728 is an apocalyptic number.

28966728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28966728 is an abundant number, since it is smaller than the sum of its proper divisors (53795832).

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

28966728 is a wasteful number, since it uses less digits than its factorization.

28966728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172437 (or 172433 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 28966728 is about 5382.0746929042. The cubic root of 28966728 is about 307.1141409090.

The spelling of 28966728 in words is "twenty-eight million, nine hundred sixty-six thousand, seven hundred twenty-eight".