28723308 has 24 divisors (see below), whose sum is σ = 67315248. Its totient is φ = 9532416.

The previous prime is 28723249. The next prime is 28723309. The reversal of 28723308 is 80332782.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28723309) 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, 2341 + ... + 7932.

It is an arithmetic number, because the mean of its divisors is an integer number (2804802).

Almost surely, 2^28723308 is an apocalyptic number.

It is an amenable number.

28723308 is an abundant number, since it is smaller than the sum of its proper divisors (38591940).

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

28723308 is a wasteful number, since it uses less digits than its factorization.

28723308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10513 (or 10511 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 28723308 is about 5359.4130275619. The cubic root of 28723308 is about 306.2514486673.

The spelling of 28723308 in words is "twenty-eight million, seven hundred twenty-three thousand, three hundred eight".