5618781 has 48 divisors (see below), whose sum is σ = 10068480. Its totient is φ = 3084480.

The previous prime is 5618777. The next prime is 5618819. The reversal of 5618781 is 1878165.

It is not a de Polignac number, because 5618781 - 2² = 5618777 is a prime.

It is a super-2 number, since 2×5618781² = 63141399851922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5618581) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40945 + ... + 41081.

It is an arithmetic number, because the mean of its divisors is an integer number (209760).

Almost surely, 2^5618781 is an apocalyptic number.

It is an amenable number.

5618781 is a deficient number, since it is larger than the sum of its proper divisors (4449699).

5618781 is a wasteful number, since it uses less digits than its factorization.

5618781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 178 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 5618781 is about 2370.3968022253. The cubic root of 5618781 is about 177.7790993681.

The spelling of 5618781 in words is "five million, six hundred eighteen thousand, seven hundred eighty-one".