28207644 has 48 divisors (see below), whose sum is σ = 68468736. Its totient is φ = 9028800.

The previous prime is 28207643. The next prime is 28207649. The reversal of 28207644 is 44670282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28207643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70854 + ... + 71250.

It is an arithmetic number, because the mean of its divisors is an integer number (1426432).

Almost surely, 2^28207644 is an apocalyptic number.

It is an amenable number.

28207644 is an abundant number, since it is smaller than the sum of its proper divisors (40261092).

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

28207644 is a wasteful number, since it uses less digits than its factorization.

28207644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 28207644 is about 5311.0868944125. The cubic root of 28207644 is about 304.4076796060.

The spelling of 28207644 in words is "twenty-eight million, two hundred seven thousand, six hundred forty-four".