28640652 has 24 divisors (see below), whose sum is σ = 68984832. Its totient is φ = 9238800.

The previous prime is 28640639. The next prime is 28640653. The reversal of 28640652 is 25604682.

It is not an unprimeable number, because it can be changed into a prime (28640653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38124 + ... + 38867.

It is an arithmetic number, because the mean of its divisors is an integer number (2874368).

Almost surely, 2^28640652 is an apocalyptic number.

It is an amenable number.

28640652 is an abundant number, since it is smaller than the sum of its proper divisors (40344180).

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

28640652 is a wasteful number, since it uses less digits than its factorization.

28640652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77029 (or 77027 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 28640652 is about 5351.6961797172. The cubic root of 28640652 is about 305.9574036140.

It can be divided in two parts, 28640 and 652, that added together give a palindrome (29292).

The spelling of 28640652 in words is "twenty-eight million, six hundred forty thousand, six hundred fifty-two".