28011512 has 16 divisors (see below), whose sum is σ = 55611360. Its totient is φ = 13181824.

The previous prime is 28011499. The next prime is 28011523. The reversal of 28011512 is 21511082.

It is a happy number.

It is a super-2 number, since 2×28011512² = 1569289609052288, which contains 22 as substring.

It is a congruent number.

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, 102848 + ... + 103119.

It is an arithmetic number, because the mean of its divisors is an integer number (3475710).

Almost surely, 2^28011512 is an apocalyptic number.

It is an amenable number.

28011512 is a deficient number, since it is larger than the sum of its proper divisors (27599848).

28011512 is a wasteful number, since it uses less digits than its factorization.

28011512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205990 (or 205986 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 28011512 is about 5292.5902920971. The cubic root of 28011512 is about 303.7005072144.

Adding to 28011512 its reverse (21511082), we get a palindrome (49522594).

The spelling of 28011512 in words is "twenty-eight million, eleven thousand, five hundred twelve".