286820646 has 16 divisors (see below), whose sum is σ = 655590144. Its totient is φ = 81948744.

The previous prime is 286820641. The next prime is 286820647. The reversal of 286820646 is 646028682.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 6829063 = 286820646 / (2 + 8 + 6 + 8 + 2 + 0 + 6 + 4 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 286820598 and 286820607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (286820641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3414490 + ... + 3414573.

It is an arithmetic number, because the mean of its divisors is an integer number (40974384).

Almost surely, 2^286820646 is an apocalyptic number.

286820646 is an abundant number, since it is smaller than the sum of its proper divisors (368769498).

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

286820646 is a wasteful number, since it uses less digits than its factorization.

286820646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6829075.

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 286820646 is about 16935.7800528939. The cubic root of 286820646 is about 659.4827949849.

The spelling of 286820646 in words is "two hundred eighty-six million, eight hundred twenty thousand, six hundred forty-six".