28713969 has 24 divisors (see below), whose sum is σ = 44756712. Its totient is φ = 17671680.

The previous prime is 28713953. The next prime is 28713983. The reversal of 28713969 is 96931782.

It can be written as a sum of positive squares in 4 ways, for example, as 9529569 + 19184400 = 3087^2 + 4380^2 .

It is not a de Polignac number, because 28713969 - 2⁴ = 28713953 is a prime.

It is a super-2 number, since 2×28713969² = 1648984031465922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28713929) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6339 + ... + 9879.

It is an arithmetic number, because the mean of its divisors is an integer number (1864863).

Almost surely, 2^28713969 is an apocalyptic number.

It is an amenable number.

28713969 is a deficient number, since it is larger than the sum of its proper divisors (16042743).

28713969 is a wasteful number, since it uses less digits than its factorization.

28713969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617 (or 3614 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 28713969 is about 5358.5416859440. The cubic root of 28713969 is about 306.2182538799.

The spelling of 28713969 in words is "twenty-eight million, seven hundred thirteen thousand, nine hundred sixty-nine".