1808631864 has 192 divisors, whose sum is σ = 5696308800. Its totient is φ = 513773568.

The previous prime is 1808631829. The next prime is 1808631871. The reversal of 1808631864 is 4681368081.

It is a happy number.

1808631864 is a `hidden beast` number, since 1 + 8 + 0 + 8 + 631 + 8 + 6 + 4 = 666.

It is a super-2 number, since 2×1808631864² = 6542298438952228992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 622864 + ... + 625760.

It is an arithmetic number, because the mean of its divisors is an integer number (29668275).

Almost surely, 2^1808631864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1808631864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2848154400).

1808631864 is an abundant number, since it is smaller than the sum of its proper divisors (3887676936).

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

1808631864 is a wasteful number, since it uses less digits than its factorization.

1808631864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2974 (or 2967 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 1808631864 is about 42528.0126975150. The cubic root of 1808631864 is about 1218.3817710122.

The spelling of 1808631864 in words is "one billion, eight hundred eight million, six hundred thirty-one thousand, eight hundred sixty-four".