28509512 has 16 divisors (see below), whose sum is σ = 55779840. Its totient is φ = 13634896.

The previous prime is 28509497. The next prime is 28509521. The reversal of 28509512 is 21590582.

It is a super-3 number, since 3×28509512³ (a number of 23 digits) contains 333 as substring.

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, 77288 + ... + 77655.

It is an arithmetic number, because the mean of its divisors is an integer number (3486240).

Almost surely, 2^28509512 is an apocalyptic number.

It is an amenable number.

28509512 is a deficient number, since it is larger than the sum of its proper divisors (27270328).

28509512 is a wasteful number, since it uses less digits than its factorization.

28509512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154972 (or 154968 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 28509512 is about 5339.4299321182. The cubic root of 28509512 is about 305.4897158319.

The spelling of 28509512 in words is "twenty-eight million, five hundred nine thousand, five hundred twelve".