28678541 has 4 divisors (see below), whose sum is σ = 30365532. Its totient is φ = 26991552.

The previous prime is 28678537. The next prime is 28678567. The reversal of 28678541 is 14587682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21808900 + 6869641 = 4670^2 + 2621^2 .

It is a cyclic number.

It is not a de Polignac number, because 28678541 - 2² = 28678537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28678511) 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, 843470 + ... + 843503.

It is an arithmetic number, because the mean of its divisors is an integer number (7591383).

Almost surely, 2^28678541 is an apocalyptic number.

It is an amenable number.

28678541 is a deficient number, since it is larger than the sum of its proper divisors (1686991).

28678541 is a wasteful number, since it uses less digits than its factorization.

28678541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686990.

The product of its digits is 107520, while the sum is 41.

The square root of 28678541 is about 5355.2349154822. The cubic root of 28678541 is about 306.0922621816.

The spelling of 28678541 in words is "twenty-eight million, six hundred seventy-eight thousand, five hundred forty-one".