651980 has 24 divisors (see below), whose sum is σ = 1565088. Its totient is φ = 223488.

The previous prime is 651971. The next prime is 651997. The reversal of 651980 is 89156.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 2189 + ... + 2468.

It is an arithmetic number, because the mean of its divisors is an integer number (65212).

2⁶⁵¹⁹⁸⁰ is an apocalyptic number.

It is an amenable number.

651980 is an abundant number, since it is smaller than the sum of its proper divisors (913108).

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

651980 is a wasteful number, since it uses less digits than its factorization.

651980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4673 (or 4671 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 651980 is about 807.4527849974. The cubic root of 651980 is about 86.7117779612.

The spelling of 651980 in words is "six hundred fifty-one thousand, nine hundred eighty".