819207664 has 40 divisors (see below), whose sum is σ = 1735388928. Its totient is φ = 371532480.

The previous prime is 819207647. The next prime is 819207673. The reversal of 819207664 is 466702918.

It is a super-2 number, since 2×819207664² = 1342202393512673792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 819207664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77209 + ... + 87175.

Almost surely, 2^819207664 is an apocalyptic number.

It is an amenable number.

819207664 is an abundant number, since it is smaller than the sum of its proper divisors (916181264).

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

819207664 is a wasteful number, since it uses less digits than its factorization.

819207664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10453 (or 10447 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 819207664 is about 28621.8039962543. The cubic root of 819207664 is about 935.6885941451.

The spelling of 819207664 in words is "eight hundred nineteen million, two hundred seven thousand, six hundred sixty-four".