651980880 has 80 divisors (see below), whose sum is σ = 2245719360. Its totient is φ = 173860992.

The previous prime is 651980873. The next prime is 651980881. The reversal of 651980880 is 88089156.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651980881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148762 + ... + 153081.

It is an arithmetic number, because the mean of its divisors is an integer number (28071492).

Almost surely, 2^651980880 is an apocalyptic number.

651980880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

651980880 is an abundant number, since it is smaller than the sum of its proper divisors (1593738480).

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

651980880 is a wasteful number, since it uses less digits than its factorization.

651980880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301865 (or 301853 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 651980880 is about 25533.9162683675. The cubic root of 651980880 is about 867.1181697385.

The spelling of 651980880 in words is "six hundred fifty-one million, nine hundred eighty thousand, eight hundred eighty".