651040 has 48 divisors (see below), whose sum is σ = 1661688. Its totient is φ = 239616.

The previous prime is 651029. The next prime is 651043. The reversal of 651040 is 40156.

651040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 183184 + 467856 = 428^2 + 684^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 651040.

It is not an unprimeable number, because it can be changed into a prime (651043) 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, 1924 + ... + 2236.

2⁶⁵¹⁰⁴⁰ 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 651040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (830844).

651040 is an abundant number, since it is smaller than the sum of its proper divisors (1010648).

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

651040 is a wasteful number, since it uses less digits than its factorization.

651040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 651040 is about 806.8704976637. The cubic root of 651040 is about 86.6700853352.

Adding to 651040 its reverse (40156), we get a palindrome (691196).

It can be divided in two parts, 65 and 1040, that multiplied together give a square (67600 = 260²).

The spelling of 651040 in words is "six hundred fifty-one thousand, forty".