651645020 has 96 divisors (see below), whose sum is σ = 1568548800. Its totient is φ = 225275904.

The previous prime is 651645019. The next prime is 651645023. The reversal of 651645020 is 20546156.

651645020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651645023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1674986 + ... + 1675374.

It is an arithmetic number, because the mean of its divisors is an integer number (16339050).

Almost surely, 2^651645020 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 651645020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784274400).

651645020 is an abundant number, since it is smaller than the sum of its proper divisors (916903780).

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

651645020 is a wasteful number, since it uses less digits than its factorization.

651645020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 651645020 is about 25527.3386783660. The cubic root of 651645020 is about 866.9692490469.

The spelling of 651645020 in words is "six hundred fifty-one million, six hundred forty-five thousand, twenty".