6251397440 has 28 divisors (see below), whose sum is σ = 14886140916. Its totient is φ = 2500558848.

The previous prime is 6251397431. The next prime is 6251397487. The reversal of 6251397440 is 447931526.

It can be written as a sum of positive squares in 2 ways, for example, as 759994624 + 5491402816 = 27568^2 + 74104^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9767489 + ... + 9768128.

Almost surely, 2^6251397440 is an apocalyptic number.

It is an amenable number.

6251397440 is an abundant number, since it is smaller than the sum of its proper divisors (8634743476).

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

6251397440 is a wasteful number, since it uses less digits than its factorization.

6251397440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19535634 (or 19535624 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 6251397440 is about 79065.7791968181. The cubic root of 6251397440 is about 1842.1530247689.

The spelling of 6251397440 in words is "six billion, two hundred fifty-one million, three hundred ninety-seven thousand, four hundred forty".