28431628 has 12 divisors (see below), whose sum is σ = 50599080. Its totient is φ = 13974752.

The previous prime is 28431589. The next prime is 28431647. The reversal of 28431628 is 82613482.

It is a junction number, because it is equal to n+sod(n) for n = 28431593 and 28431602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60001 + ... + 60472.

It is an arithmetic number, because the mean of its divisors is an integer number (4216590).

Almost surely, 2^28431628 is an apocalyptic number.

It is an amenable number.

28431628 is a deficient number, since it is larger than the sum of its proper divisors (22167452).

28431628 is a wasteful number, since it uses less digits than its factorization.

28431628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120536 (or 120534 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 28431628 is about 5332.1316562891. The cubic root of 28431628 is about 305.2112770646.

The spelling of 28431628 in words is "twenty-eight million, four hundred thirty-one thousand, six hundred twenty-eight".