651616 has 24 divisors (see below), whose sum is σ = 1466640. Its totient is φ = 279168.

The previous prime is 651587. The next prime is 651617. The reversal of 651616 is 616156.

It is a super-2 number, since 2×651616² = 849206822912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651617) by changing a digit.

651616 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, 1231 + ... + 1678.

It is an arithmetic number, because the mean of its divisors is an integer number (61110).

2⁶⁵¹⁶¹⁶ is an apocalyptic number.

It is an amenable number.

651616 is an abundant number, since it is smaller than the sum of its proper divisors (815024).

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

651616 is a wasteful number, since it uses less digits than its factorization.

651616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926 (or 2918 counting only the distinct ones).

The product of its digits is 1080, while the sum is 25.

The square root of 651616 is about 807.2273533522. The cubic root of 651616 is about 86.6956379146.

It can be divided in two parts, 65 and 1616, that added together give a square (1681 = 41²).

The spelling of 651616 in words is "six hundred fifty-one thousand, six hundred sixteen".