651722540 has 72 divisors (see below), whose sum is σ = 1685759040. Its totient is φ = 210298368.

The previous prime is 651722527. The next prime is 651722567. The reversal of 651722540 is 45227156.

It is a junction number, because it is equal to n+sod(n) for n = 651722497 and 651722506.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2900 + ... + 36219.

It is an arithmetic number, because the mean of its divisors is an integer number (23413320).

Almost surely, 2^651722540 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 651722540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842879520).

651722540 is an abundant number, since it is smaller than the sum of its proper divisors (1034036500).

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

651722540 is a wasteful number, since it uses less digits than its factorization.

651722540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39159 (or 39150 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 651722540 is about 25528.8570053577. The cubic root of 651722540 is about 867.0036260412.

Adding to 651722540 its reverse (45227156), we get a palindrome (696949696).

The spelling of 651722540 in words is "six hundred fifty-one million, seven hundred twenty-two thousand, five hundred forty".