651425440 has 48 divisors (see below), whose sum is σ = 1544576040. Its totient is φ = 259624960.

The previous prime is 651425429. The next prime is 651425471. The reversal of 651425440 is 44524156.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 460875024 + 190550416 = 21468^2 + 13804^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37716 + ... + 52204.

Almost surely, 2^651425440 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 651425440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (772288020).

651425440 is an abundant number, since it is smaller than the sum of its proper divisors (893150600).

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

651425440 is a wasteful number, since it uses less digits than its factorization.

651425440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14785 (or 14777 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 651425440 is about 25523.0374367942. The cubic root of 651425440 is about 866.8718593699.

Adding to 651425440 its reverse (44524156), we get a palindrome (695949596).

The spelling of 651425440 in words is "six hundred fifty-one million, four hundred twenty-five thousand, four hundred forty".