823457864 has 16 divisors (see below), whose sum is σ = 1544353020. Its totient is φ = 411630400.

The previous prime is 823457863. The next prime is 823457881. The reversal of 823457864 is 468754328.

It can be written as a sum of positive squares in 2 ways, for example, as 700025764 + 123432100 = 26458^2 + 11110^2 .

It is not an unprimeable number, because it can be changed into a prime (823457861) 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, 33014 + ... + 52314.

Almost surely, 2^823457864 is an apocalyptic number.

It is an amenable number.

823457864 is a deficient number, since it is larger than the sum of its proper divisors (720895156).

823457864 is a wasteful number, since it uses less digits than its factorization.

823457864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24640 (or 24636 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 47.

The square root of 823457864 is about 28695.9555338379. The cubic root of 823457864 is about 937.3039785487.

It can be divided in two parts, 82345 and 7864, that added together give a palindrome (90209).

The spelling of 823457864 in words is "eight hundred twenty-three million, four hundred fifty-seven thousand, eight hundred sixty-four".