651646320 has 160 divisors (see below), whose sum is σ = 2185526784. Its totient is φ = 159667200.

The previous prime is 651646283. The next prime is 651646337. The reversal of 651646320 is 23646156.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1032405 + ... + 1033035.

Almost surely, 2^651646320 is an apocalyptic number.

651646320 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 651646320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1092763392).

651646320 is an abundant number, since it is smaller than the sum of its proper divisors (1533880464).

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

651646320 is a wasteful number, since it uses less digits than its factorization.

651646320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991 (or 985 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 651646320 is about 25527.3641412505. The cubic root of 651646320 is about 866.9698255670.

The spelling of 651646320 in words is "six hundred fifty-one million, six hundred forty-six thousand, three hundred twenty".