651080 has 32 divisors (see below), whose sum is σ = 1504440. Its totient is φ = 253440.

The previous prime is 651071. The next prime is 651097. The reversal of 651080 is 80156.

It can be written as a sum of positive squares in 4 ways, for example, as 407044 + 244036 = 638^2 + 494^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

651080 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 7 ways as a sum of consecutive naturals, for example, 1442 + ... + 1838.

2⁶⁵¹⁰⁸⁰ 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 651080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (752220).

651080 is an abundant number, since it is smaller than the sum of its proper divisors (853360).

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

651080 is a wasteful number, since it uses less digits than its factorization.

651080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 651080 is about 806.8952844081. The cubic root of 651080 is about 86.6718603068.

The spelling of 651080 in words is "six hundred fifty-one thousand, eighty".