28728592 has 10 divisors (see below), whose sum is σ = 55661678. Its totient is φ = 14364288.

The previous prime is 28728571. The next prime is 28728593. The reversal of 28728592 is 29582782.

It can be written as a sum of positive squares in only one way, i.e., 14470416 + 14258176 = 3804^2 + 3776^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 897753 + ... + 897784.

Almost surely, 2^28728592 is an apocalyptic number.

It is an amenable number.

28728592 is a deficient number, since it is larger than the sum of its proper divisors (26933086).

28728592 is a wasteful number, since it uses less digits than its factorization.

28728592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795545 (or 1795539 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 28728592 is about 5359.9059693245. The cubic root of 28728592 is about 306.2702270689.

The spelling of 28728592 in words is "twenty-eight million, seven hundred twenty-eight thousand, five hundred ninety-two".