28644737 has 8 divisors (see below), whose sum is σ = 31689792. Its totient is φ = 25673200.

The previous prime is 28644731. The next prime is 28644743. The reversal of 28644737 is 73744682.

It is an interprime number because it is at equal distance from previous prime (28644731) and next prime (28644743).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28644737 - 2¹⁸ = 28382593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28644694 and 28644703.

It is not an unprimeable number, because it can be changed into a prime (28644731) 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, 17558 + ... + 19119.

It is an arithmetic number, because the mean of its divisors is an integer number (3961224).

Almost surely, 2^28644737 is an apocalyptic number.

It is an amenable number.

28644737 is a deficient number, since it is larger than the sum of its proper divisors (3045055).

28644737 is a wasteful number, since it uses less digits than its factorization.

28644737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36759.

The product of its digits is 225792, while the sum is 41.

The square root of 28644737 is about 5352.0778208094. The cubic root of 28644737 is about 305.9719490997.

The spelling of 28644737 in words is "twenty-eight million, six hundred forty-four thousand, seven hundred thirty-seven".