28652840 has 16 divisors (see below), whose sum is σ = 64468980. Its totient is φ = 11461120.

The previous prime is 28652821. The next prime is 28652857. The reversal of 28652840 is 4825682.

It can be written as a sum of positive squares in 2 ways, for example, as 25020004 + 3632836 = 5002^2 + 1906^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28652840.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358121 + ... + 358200.

Almost surely, 2^28652840 is an apocalyptic number.

28652840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28652840 is an abundant number, since it is smaller than the sum of its proper divisors (35816140).

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

28652840 is a wasteful number, since it uses less digits than its factorization.

28652840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716332 (or 716328 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 28652840 is about 5352.8347630017. The cubic root of 28652840 is about 306.0007974120. Note that the first 3 decimals are identical.

It can be divided in two parts, 28652 and 840, that added together give a palindrome (29492).

The spelling of 28652840 in words is "twenty-eight million, six hundred fifty-two thousand, eight hundred forty".