28561837 has 4 divisors (see below), whose sum is σ = 29803680. Its totient is φ = 27319996.

The previous prime is 28561829. The next prime is 28561867. The reversal of 28561837 is 73816582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28561837 - 2³ = 28561829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28561837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28561867) 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, 620887 + ... + 620932.

It is an arithmetic number, because the mean of its divisors is an integer number (7450920).

Almost surely, 2^28561837 is an apocalyptic number.

It is an amenable number.

28561837 is a deficient number, since it is larger than the sum of its proper divisors (1241843).

28561837 is a wasteful number, since it uses less digits than its factorization.

28561837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241842.

The product of its digits is 80640, while the sum is 40.

The square root of 28561837 is about 5344.3275535843. The cubic root of 28561837 is about 305.6764953662.

The spelling of 28561837 in words is "twenty-eight million, five hundred sixty-one thousand, eight hundred thirty-seven".