864806836 has 6 divisors (see below), whose sum is σ = 1513411970. Its totient is φ = 432403416.

The previous prime is 864806819. The next prime is 864806851. The reversal of 864806836 is 638608468.

It can be written as a sum of positive squares in only one way, i.e., 805424400 + 59382436 = 28380^2 + 7706^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 864806836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108100851 + ... + 108100858.

Almost surely, 2^864806836 is an apocalyptic number.

It is an amenable number.

864806836 is a deficient number, since it is larger than the sum of its proper divisors (648605134).

864806836 is a wasteful number, since it uses less digits than its factorization.

864806836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216201713 (or 216201711 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 49.

The square root of 864806836 is about 29407.5982698350. The cubic root of 864806836 is about 952.7370140152.

The spelling of 864806836 in words is "eight hundred sixty-four million, eight hundred six thousand, eight hundred thirty-six".