28912644 has 36 divisors (see below), whose sum is σ = 74181744. Its totient is φ = 9492912.

The previous prime is 28912643. The next prime is 28912669. The reversal of 28912644 is 44621982.

28912644 is a `hidden beast` number, since 2 + 8 + 9 + 1 + 2 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28912599 and 28912608.

It is not an unprimeable number, because it can be changed into a prime (28912643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3582 + ... + 8405.

It is an arithmetic number, because the mean of its divisors is an integer number (2060604).

Almost surely, 2^28912644 is an apocalyptic number.

It is an amenable number.

28912644 is an abundant number, since it is smaller than the sum of its proper divisors (45269100).

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

28912644 is a wasteful number, since it uses less digits than its factorization.

28912644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12064 (or 12059 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 28912644 is about 5377.0478889443. The cubic root of 28912644 is about 306.9228834375.

The spelling of 28912644 in words is "twenty-eight million, nine hundred twelve thousand, six hundred forty-four".