28428712 has 32 divisors (see below), whose sum is σ = 60429600. Its totient is φ = 12429504.

The previous prime is 28428689. The next prime is 28428739. The reversal of 28428712 is 21782482.

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, 5218 + ... + 9169.

It is an arithmetic number, because the mean of its divisors is an integer number (1888425).

Almost surely, 2^28428712 is an apocalyptic number.

It is an amenable number.

28428712 is an abundant number, since it is smaller than the sum of its proper divisors (32000888).

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

28428712 is a wasteful number, since it uses less digits than its factorization.

28428712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14425 (or 14421 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 28428712 is about 5331.8582126685. The cubic root of 28428712 is about 305.2008423648.

The spelling of 28428712 in words is "twenty-eight million, four hundred twenty-eight thousand, seven hundred twelve".