28312724 has 48 divisors (see below), whose sum is σ = 57165696. Its totient is φ = 12144000.

The previous prime is 28312721. The next prime is 28312727. The reversal of 28312724 is 42721382.

It is an interprime number because it is at equal distance from previous prime (28312721) and next prime (28312727).

It is a super-2 number, since 2×28312724² = 1603220680600352, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28312721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102074 + ... + 102350.

It is an arithmetic number, because the mean of its divisors is an integer number (1190952).

Almost surely, 2^28312724 is an apocalyptic number.

It is an amenable number.

28312724 is an abundant number, since it is smaller than the sum of its proper divisors (28852972).

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

28312724 is a wasteful number, since it uses less digits than its factorization.

28312724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416 (or 414 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 28312724 is about 5320.9702122827. The cubic root of 28312724 is about 304.7852075451.

It can be divided in two parts, 2831 and 2724, that added together give a palindrome (5555).

The spelling of 28312724 in words is "twenty-eight million, three hundred twelve thousand, seven hundred twenty-four".