634876866 has 192 divisors, whose sum is σ = 1703939328. Its totient is φ = 175177728.

The previous prime is 634876831. The next prime is 634876871. The reversal of 634876866 is 668678436.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2470210 + ... + 2470466.

It is an arithmetic number, because the mean of its divisors is an integer number (8874684).

Almost surely, 2^634876866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 634876866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (851969664).

634876866 is an abundant number, since it is smaller than the sum of its proper divisors (1069062462).

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

634876866 is a wasteful number, since it uses less digits than its factorization.

634876866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 315 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 634876866 is about 25196.7630063864. The cubic root of 634876866 is about 859.4682425699.

The spelling of 634876866 in words is "six hundred thirty-four million, eight hundred seventy-six thousand, eight hundred sixty-six".