651831264 has 144 divisors (see below), whose sum is σ = 2127277152. Its totient is φ = 185462784.

The previous prime is 651831263. The next prime is 651831307. The reversal of 651831264 is 462138156.

It is a happy number.

651831264 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651831263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 630492 + ... + 631524.

It is an arithmetic number, because the mean of its divisors is an integer number (14772758).

Almost surely, 2^651831264 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 651831264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1063638576).

651831264 is an abundant number, since it is smaller than the sum of its proper divisors (1475445888).

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

651831264 is a wasteful number, since it uses less digits than its factorization.

651831264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369 (or 1358 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 651831264 is about 25530.9863499239. The cubic root of 651831264 is about 867.0518361588.

The spelling of 651831264 in words is "six hundred fifty-one million, eight hundred thirty-one thousand, two hundred sixty-four".