651002440 has 128 divisors (see below), whose sum is σ = 1668470400. Its totient is φ = 226437120.

The previous prime is 651002399. The next prime is 651002447. The reversal of 651002440 is 44200156.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (651002447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2079724 + ... + 2080036.

It is an arithmetic number, because the mean of its divisors is an integer number (13034925).

Almost surely, 2^651002440 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 651002440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (834235200).

651002440 is an abundant number, since it is smaller than the sum of its proper divisors (1017467960).

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

651002440 is a wasteful number, since it uses less digits than its factorization.

651002440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527 (or 523 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 651002440 is about 25514.7494598712. The cubic root of 651002440 is about 866.6841857077.

Adding to 651002440 its reverse (44200156), we get a palindrome (695202596).

The spelling of 651002440 in words is "six hundred fifty-one million, two thousand, four hundred forty".