821768 has 16 divisors (see below), whose sum is σ = 1554000. Its totient is φ = 407376.

The previous prime is 821759. The next prime is 821771. The reversal of 821768 is 867128.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743 + ... + 1481.

It is an arithmetic number, because the mean of its divisors is an integer number (97125).

2⁸²¹⁷⁶⁸ is an apocalyptic number.

It is an amenable number.

821768 is a deficient number, since it is larger than the sum of its proper divisors (732232).

821768 is a wasteful number, since it uses less digits than its factorization.

821768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 880 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 821768 is about 906.5142028672. The cubic root of 821768 is about 93.6662374795. Note that the first 3 decimals are identical.

The spelling of 821768 in words is "eight hundred twenty-one thousand, seven hundred sixty-eight".