6318721432 has 24 divisors (see below), whose sum is σ = 12585520260. Its totient is φ = 2973514880.

The previous prime is 6318721429. The next prime is 6318721433. The reversal of 6318721432 is 2341278136.

It is a happy number.

It is a super-2 number, since 2×6318721432² = 79852481070432261248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6318721391 and 6318721400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6318721433) 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, 1364194 + ... + 1368817.

Almost surely, 2^6318721432 is an apocalyptic number.

It is an amenable number.

6318721432 is a deficient number, since it is larger than the sum of its proper divisors (6266798828).

6318721432 is a wasteful number, since it uses less digits than its factorization.

6318721432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733051 (or 2733030 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 6318721432 is about 79490.3857834392. The cubic root of 6318721432 is about 1848.7424062752.

Adding to 6318721432 its reverse (2341278136), we get a palindrome (8659999568).

The spelling of 6318721432 in words is "six billion, three hundred eighteen million, seven hundred twenty-one thousand, four hundred thirty-two".