864428 has 6 divisors (see below), whose sum is σ = 1512756. Its totient is φ = 432212.

The previous prime is 864427. The next prime is 864439. The reversal of 864428 is 824468.

It is a junction number, because it is equal to n+sod(n) for n = 864394 and 864403.

It is not an unprimeable number, because it can be changed into a prime (864427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108050 + ... + 108057.

It is an arithmetic number, because the mean of its divisors is an integer number (252126).

2⁸⁶⁴⁴²⁸ is an apocalyptic number.

It is an amenable number.

864428 is a deficient number, since it is larger than the sum of its proper divisors (648328).

864428 is a wasteful number, since it uses less digits than its factorization.

864428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216111 (or 216109 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 864428 is about 929.7462019282. The cubic root of 864428 is about 95.2597875508.

The spelling of 864428 in words is "eight hundred sixty-four thousand, four hundred twenty-eight".