28731534 has 32 divisors (see below), whose sum is σ = 65143680. Its totient is φ = 8374752.

The previous prime is 28731517. The next prime is 28731551. The reversal of 28731534 is 43513782.

It is an interprime number because it is at equal distance from previous prime (28731517) and next prime (28731551).

It is a junction number, because it is equal to n+sod(n) for n = 28731495 and 28731504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8212 + ... + 11175.

It is an arithmetic number, because the mean of its divisors is an integer number (2035740).

Almost surely, 2^28731534 is an apocalyptic number.

28731534 is an abundant number, since it is smaller than the sum of its proper divisors (36412146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28731534 is a wasteful number, since it uses less digits than its factorization.

28731534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19424.

The product of its digits is 20160, while the sum is 33.

The square root of 28731534 is about 5360.1804074117. The cubic root of 28731534 is about 306.2806814187.

The spelling of 28731534 in words is "twenty-eight million, seven hundred thirty-one thousand, five hundred thirty-four".