28561836 has 24 divisors (see below), whose sum is σ = 70565040. Its totient is φ = 8960512.

The previous prime is 28561829. The next prime is 28561867. The reversal of 28561836 is 63816582.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28561794 and 28561803.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69801 + ... + 70208.

It is an arithmetic number, because the mean of its divisors is an integer number (2940210).

Almost surely, 2^28561836 is an apocalyptic number.

It is an amenable number.

28561836 is an abundant number, since it is smaller than the sum of its proper divisors (42003204).

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

28561836 is a wasteful number, since it uses less digits than its factorization.

28561836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140033 (or 140031 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

The square root of 28561836 is about 5344.3274600271. The cubic root of 28561836 is about 305.6764917988.

The spelling of 28561836 in words is "twenty-eight million, five hundred sixty-one thousand, eight hundred thirty-six".