28806836 has 6 divisors (see below), whose sum is σ = 50411970. Its totient is φ = 14403416.

The previous prime is 28806829. The next prime is 28806839. The reversal of 28806836 is 63860882.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 10368400 = 4294^2 + 3220^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28806793 and 28806802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28806839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3600851 + ... + 3600858.

It is an arithmetic number, because the mean of its divisors is an integer number (8401995).

Almost surely, 2^28806836 is an apocalyptic number.

It is an amenable number.

28806836 is a deficient number, since it is larger than the sum of its proper divisors (21605134).

28806836 is a wasteful number, since it uses less digits than its factorization.

28806836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7201713 (or 7201711 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 28806836 is about 5367.2000149054. The cubic root of 28806836 is about 306.5480233133.

The spelling of 28806836 in words is "twenty-eight million, eight hundred six thousand, eight hundred thirty-six".