5638182781 has 8 divisors (see below), whose sum is σ = 7029422784. Its totient is φ = 4393389120.

The previous prime is 5638182757. The next prime is 5638182853. The reversal of 5638182781 is 1872818365.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5638182781 - 2¹⁵ = 5638150013 is a prime.

It is a super-2 number, since 2×5638182781² = 63578210143929787922, 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 (5638182701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36611500 + ... + 36611653.

It is an arithmetic number, because the mean of its divisors is an integer number (878677848).

Almost surely, 2^5638182781 is an apocalyptic number.

It is an amenable number.

5638182781 is a deficient number, since it is larger than the sum of its proper divisors (1391240003).

5638182781 is a wasteful number, since it uses less digits than its factorization.

5638182781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73223171.

The product of its digits is 645120, while the sum is 49.

The square root of 5638182781 is about 75087.8337748533. The cubic root of 5638182781 is about 1779.8348941039.

The spelling of 5638182781 in words is "five billion, six hundred thirty-eight million, one hundred eighty-two thousand, seven hundred eighty-one".