651712 has 28 divisors (see below), whose sum is σ = 1371600. Its totient is φ = 306176.

The previous prime is 651697. The next prime is 651727. The reversal of 651712 is 217156.

It is an interprime number because it is at equal distance from previous prime (651697) and next prime (651727).

It is a congruent number.

It is an unprimeable number.

651712 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789 + ... + 1387.

2⁶⁵¹⁷¹² 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 651712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (685800).

651712 is an abundant number, since it is smaller than the sum of its proper divisors (719888).

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

651712 is a wasteful number, since it uses less digits than its factorization.

651712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 618 counting only the distinct ones).

The product of its digits is 420, while the sum is 22.

The square root of 651712 is about 807.2868139639. The cubic root of 651712 is about 86.6998952136.

Adding to 651712 its reverse (217156), we get a palindrome (868868).

The spelling of 651712 in words is "six hundred fifty-one thousand, seven hundred twelve".