28281532 has 24 divisors (see below), whose sum is σ = 50626800. Its totient is φ = 13819776.

The previous prime is 28281511. The next prime is 28281553. The reversal of 28281532 is 23518282.

It is an interprime number because it is at equal distance from previous prime (28281511) and next prime (28281553).

It is a junction number, because it is equal to n+sod(n) for n = 28281494 and 28281503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68944 + ... + 69352.

It is an arithmetic number, because the mean of its divisors is an integer number (2109450).

Almost surely, 2^28281532 is an apocalyptic number.

It is an amenable number.

28281532 is a deficient number, since it is larger than the sum of its proper divisors (22345268).

28281532 is a wasteful number, since it uses less digits than its factorization.

28281532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765 (or 763 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 28281532 is about 5318.0383601475. The cubic root of 28281532 is about 304.6732395885.

The spelling of 28281532 in words is "twenty-eight million, two hundred eighty-one thousand, five hundred thirty-two".