28678436 has 6 divisors (see below), whose sum is σ = 50187270. Its totient is φ = 14339216.

The previous prime is 28678421. The next prime is 28678453. The reversal of 28678436 is 63487682.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 10240000 = 4294^2 + 3200^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3584801 + ... + 3584808.

It is an arithmetic number, because the mean of its divisors is an integer number (8364545).

Almost surely, 2^28678436 is an apocalyptic number.

It is an amenable number.

28678436 is a deficient number, since it is larger than the sum of its proper divisors (21508834).

28678436 is a wasteful number, since it uses less digits than its factorization.

28678436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7169613 (or 7169611 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The square root of 28678436 is about 5355.2251119818. The cubic root of 28678436 is about 306.0918886186.

The spelling of 28678436 in words is "twenty-eight million, six hundred seventy-eight thousand, four hundred thirty-six".