651712320 has 168 divisors, whose sum is σ = 2561929344. Its totient is φ = 148958208.

The previous prime is 651712277. The next prime is 651712351. The reversal of 651712320 is 23217156.

It is a happy number.

651712320 is a `hidden beast` number, since 6 + 517 + 123 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3997 + ... + 36323.

Almost surely, 2^651712320 is an apocalyptic number.

651712320 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 651712320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1280964672).

651712320 is an abundant number, since it is smaller than the sum of its proper divisors (1910217024).

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

651712320 is a wasteful number, since it uses less digits than its factorization.

651712320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32357 (or 32344 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 651712320 is about 25528.6568389330. The cubic root of 651712320 is about 866.9990940393. Note that the first 3 decimals are identical.

Adding to 651712320 its reverse (23217156), we get a palindrome (674929476).

The spelling of 651712320 in words is "six hundred fifty-one million, seven hundred twelve thousand, three hundred twenty".