5638721023 has 8 divisors (see below), whose sum is σ = 6074329968. Its totient is φ = 5203377984.

The previous prime is 5638720993. The next prime is 5638721027. The reversal of 5638721023 is 3201278365.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5638721023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5638721027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21286 + ... + 108307.

It is an arithmetic number, because the mean of its divisors is an integer number (759291246).

Almost surely, 2^5638721023 is an apocalyptic number.

5638721023 is a deficient number, since it is larger than the sum of its proper divisors (435608945).

5638721023 is a wasteful number, since it uses less digits than its factorization.

5638721023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132953.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 5638721023 is about 75091.4177719398. The cubic root of 5638721023 is about 1779.8915288653.

Adding to 5638721023 its reverse (3201278365), we get a palindrome (8839999388).

The spelling of 5638721023 in words is "five billion, six hundred thirty-eight million, seven hundred twenty-one thousand, twenty-three".