28731572 has 24 divisors (see below), whose sum is σ = 53168640. Its totient is φ = 13547520.

The previous prime is 28731569. The next prime is 28731583. The reversal of 28731572 is 27513782.

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 7 ways as a sum of consecutive naturals, for example, 18797 + ... + 20267.

It is an arithmetic number, because the mean of its divisors is an integer number (2215360).

Almost surely, 2^28731572 is an apocalyptic number.

It is an amenable number.

28731572 is a deficient number, since it is larger than the sum of its proper divisors (24437068).

28731572 is a wasteful number, since it uses less digits than its factorization.

28731572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751 (or 1749 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 28731572 is about 5360.1839520673. The cubic root of 28731572 is about 306.2808164464.

The spelling of 28731572 in words is "twenty-eight million, seven hundred thirty-one thousand, five hundred seventy-two".