651580 has 12 divisors (see below), whose sum is σ = 1368360. Its totient is φ = 260624.

The previous prime is 651517. The next prime is 651587. The reversal of 651580 is 85156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651587) by changing a digit.

651580 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16270 + ... + 16309.

It is an arithmetic number, because the mean of its divisors is an integer number (114030).

2⁶⁵¹⁵⁸⁰ is an apocalyptic number.

It is an amenable number.

651580 is an abundant number, since it is smaller than the sum of its proper divisors (716780).

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

651580 is a wasteful number, since it uses less digits than its factorization.

651580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32588 (or 32586 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 651580 is about 807.2050544936. The cubic root of 651580 is about 86.6940413196.

The spelling of 651580 in words is "six hundred fifty-one thousand, five hundred eighty".