28912724 has 12 divisors (see below), whose sum is σ = 50645364. Its totient is φ = 14442624.

The previous prime is 28912721. The next prime is 28912729. The reversal of 28912724 is 42721982.

It can be written as a sum of positive squares in 2 ways, for example, as 16662724 + 12250000 = 4082^2 + 3500^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28912721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2402 + ... + 7974.

It is an arithmetic number, because the mean of its divisors is an integer number (4220447).

Almost surely, 2^28912724 is an apocalyptic number.

It is an amenable number.

28912724 is a deficient number, since it is larger than the sum of its proper divisors (21732640).

28912724 is a wasteful number, since it uses less digits than its factorization.

28912724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6874 (or 6872 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 28912724 is about 5377.0553279653. The cubic root of 28912724 is about 306.9231665179.

The spelling of 28912724 in words is "twenty-eight million, nine hundred twelve thousand, seven hundred twenty-four".