651868 has 24 divisors (see below), whose sum is σ = 1347584. Its totient is φ = 270000.

The previous prime is 651863. The next prime is 651869. The reversal of 651868 is 868156.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493 + ... + 1243.

2⁶⁵¹⁸⁶⁸ 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 651868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673792).

651868 is an abundant number, since it is smaller than the sum of its proper divisors (695716).

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

651868 is a wasteful number, since it uses less digits than its factorization.

651868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793 (or 791 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 651868 is about 807.3834281183. The cubic root of 651868 is about 86.7068124330.

The spelling of 651868 in words is "six hundred fifty-one thousand, eight hundred sixty-eight".