6406257844 has 36 divisors (see below), whose sum is σ = 13058840676. Its totient is φ = 2741848704.

The previous prime is 6406257839. The next prime is 6406257853. The reversal of 6406257844 is 4487526046.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3925022500 + 2481235344 = 62650^2 + 49812^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6406257794 and 6406257803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126784 + ... + 169960.

Almost surely, 2^6406257844 is an apocalyptic number.

It is an amenable number.

6406257844 is an abundant number, since it is smaller than the sum of its proper divisors (6652582832).

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

6406257844 is a wasteful number, since it uses less digits than its factorization.

6406257844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43952 (or 43943 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 46.

The square root of 6406257844 is about 80039.1019689751. The cubic root of 6406257844 is about 1857.2404683809.

The spelling of 6406257844 in words is "six billion, four hundred six million, two hundred fifty-seven thousand, eight hundred forty-four".