28694745 has 24 divisors (see below), whose sum is σ = 49867272. Its totient is φ = 15264000.

The previous prime is 28694737. The next prime is 28694749. The reversal of 28694745 is 54749682.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8874441 + 19820304 = 2979^2 + 4452^2 .

It is not a de Polignac number, because 28694745 - 2³ = 28694737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28694745.

It is not an unprimeable number, because it can be changed into a prime (28694749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26515 + ... + 27575.

It is an arithmetic number, because the mean of its divisors is an integer number (2077803).

Almost surely, 2^28694745 is an apocalyptic number.

It is an amenable number.

28694745 is a deficient number, since it is larger than the sum of its proper divisors (21172527).

28694745 is a wasteful number, since it uses less digits than its factorization.

28694745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1670 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28694745 is about 5356.7476139912. The cubic root of 28694745 is about 306.1499009245.

The spelling of 28694745 in words is "twenty-eight million, six hundred ninety-four thousand, seven hundred forty-five".