28351644 has 12 divisors (see below), whose sum is σ = 66153864. Its totient is φ = 9450544.

The previous prime is 28351643. The next prime is 28351703. The reversal of 28351644 is 44615382.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28351643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1181307 + ... + 1181330.

It is an arithmetic number, because the mean of its divisors is an integer number (5512822).

Almost surely, 2^28351644 is an apocalyptic number.

It is an amenable number.

28351644 is an abundant number, since it is smaller than the sum of its proper divisors (37802220).

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

28351644 is a wasteful number, since it uses less digits than its factorization.

28351644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2362644 (or 2362642 counting only the distinct ones).

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

The square root of 28351644 is about 5324.6261840621. The cubic root of 28351644 is about 304.9248009538.

The spelling of 28351644 in words is "twenty-eight million, three hundred fifty-one thousand, six hundred forty-four".