28652431 has 6 divisors (see below), whose sum is σ = 29026032. Its totient is φ = 28283580.

The previous prime is 28652419. The next prime is 28652441. The reversal of 28652431 is 13425682.

It is a de Polignac number, because none of the positive numbers 2^k-28652431 is a prime.

It is a super-2 number, since 2×28652431² = 1641923604419522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28652393 and 28652402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28652441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3946 + ... + 8536.

It is an arithmetic number, because the mean of its divisors is an integer number (4837672).

Almost surely, 2^28652431 is an apocalyptic number.

28652431 is a deficient number, since it is larger than the sum of its proper divisors (373601).

28652431 is an frugal number, since it uses more digits than its factorization.

28652431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4749 (or 4670 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 28652431 is about 5352.7965588092. The cubic root of 28652431 is about 305.9993414200. Note that the first 3 decimals are identical.

The spelling of 28652431 in words is "twenty-eight million, six hundred fifty-two thousand, four hundred thirty-one".