6440277240 has 96 divisors (see below), whose sum is σ = 22032550800. Its totient is φ = 1627015680.

The previous prime is 6440277203. The next prime is 6440277271. The reversal of 6440277240 is 427720446.

It is a happy number.

6440277240 is a `hidden beast` number, since 6 + 4 + 402 + 7 + 7 + 240 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6440277195 and 6440277204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 463941 + ... + 477620.

Almost surely, 2^6440277240 is an apocalyptic number.

6440277240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6440277240 is an abundant number, since it is smaller than the sum of its proper divisors (15592273560).

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

6440277240 is a wasteful number, since it uses less digits than its factorization.

6440277240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941597 (or 941590 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 36.

The square root of 6440277240 is about 80251.3379327722. The cubic root of 6440277240 is about 1860.5221912247.

Adding to 6440277240 its reverse (427720446), we get a palindrome (6867997686).

The spelling of 6440277240 in words is "six billion, four hundred forty million, two hundred seventy-seven thousand, two hundred forty".