651867840 has 336 divisors, whose sum is σ = 2522939328. Its totient is φ = 153280512.

The previous prime is 651867823. The next prime is 651867841. The reversal of 651867840 is 48768156.

It is a happy number.

651867840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (651867841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 860742 + ... + 861498.

It is an arithmetic number, because the mean of its divisors is an integer number (7508748).

Almost surely, 2^651867840 is an apocalyptic number.

651867840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651867840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1261469664).

651867840 is an abundant number, since it is smaller than the sum of its proper divisors (1871071488).

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

651867840 is a wasteful number, since it uses less digits than its factorization.

651867840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 803 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 651867840 is about 25531.7026459263. The cubic root of 651867840 is about 867.0680533899.

The spelling of 651867840 in words is "six hundred fifty-one million, eight hundred sixty-seven thousand, eight hundred forty".