651880 has 32 divisors (see below), whose sum is σ = 1504800. Its totient is φ = 254016.

The previous prime is 651877. The next prime is 651881. The reversal of 651880 is 88156.

It is a happy number.

651880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (651881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1531 + ... + 1909.

It is an arithmetic number, because the mean of its divisors is an integer number (47025).

2⁶⁵¹⁸⁸⁰ 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 651880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (752400).

651880 is an abundant number, since it is smaller than the sum of its proper divisors (852920).

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

651880 is a wasteful number, since it uses less digits than its factorization.

651880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 651880 is about 807.3908594974. The cubic root of 651880 is about 86.7073444811.

The spelling of 651880 in words is "six hundred fifty-one thousand, eight hundred eighty".