651360640 has 128 divisors (see below), whose sum is σ = 1788998400. Its totient is φ = 222148608.

The previous prime is 651360613. The next prime is 651360653. The reversal of 651360640 is 46063156.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1554351 + ... + 1554769.

It is an arithmetic number, because the mean of its divisors is an integer number (13976550).

Almost surely, 2^651360640 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 651360640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894499200).

651360640 is an abundant number, since it is smaller than the sum of its proper divisors (1137637760).

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

651360640 is a wasteful number, since it uses less digits than its factorization.

651360640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 651360640 is about 25521.7679638382. The cubic root of 651360640 is about 866.8431146327.

The spelling of 651360640 in words is "six hundred fifty-one million, three hundred sixty thousand, six hundred forty".