6345781 has 6 divisors (see below), whose sum is σ = 6871650. Its totient is φ = 5857488.

The previous prime is 6345763. The next prime is 6345803. The reversal of 6345781 is 1875436.

It can be written as a sum of positive squares in 3 ways, for example, as 70756 + 6275025 = 266^2 + 2505^2 .

It is not a de Polignac number, because 6345781 - 2⁵ = 6345749 is a prime.

It is a super-2 number, since 2×6345781² = 80537872999922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6345701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18606 + ... + 18943.

It is an arithmetic number, because the mean of its divisors is an integer number (1145275).

Almost surely, 2^6345781 is an apocalyptic number.

It is an amenable number.

6345781 is a deficient number, since it is larger than the sum of its proper divisors (525869).

6345781 is a wasteful number, since it uses less digits than its factorization.

6345781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37575 (or 37562 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 6345781 is about 2519.0833650358. The cubic root of 6345781 is about 185.1377693039.

The spelling of 6345781 in words is "six million, three hundred forty-five thousand, seven hundred eighty-one".