28368740 has 24 divisors (see below), whose sum is σ = 59807160. Its totient is φ = 11303168.

The previous prime is 28368731. The next prime is 28368787. The reversal of 28368740 is 4786382.

It can be written as a sum of positive squares in 4 ways, for example, as 87616 + 28281124 = 296^2 + 5318^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28368694 and 28368703.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2744 + ... + 8016.

It is an arithmetic number, because the mean of its divisors is an integer number (2491965).

Almost surely, 2^28368740 is an apocalyptic number.

28368740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28368740 is an abundant number, since it is smaller than the sum of its proper divisors (31438420).

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

28368740 is a wasteful number, since it uses less digits than its factorization.

28368740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5551 (or 5549 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 28368740 is about 5326.2313130393. The cubic root of 28368740 is about 304.9860783756.

The spelling of 28368740 in words is "twenty-eight million, three hundred sixty-eight thousand, seven hundred forty".