6422187640 has 64 divisors (see below), whose sum is σ = 15926168160. Its totient is φ = 2311249920.

The previous prime is 6422187619. The next prime is 6422187659. The reversal of 6422187640 is 467812246.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 6422187593 and 6422187602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32557 + ... + 117916.

Almost surely, 2^6422187640 is an apocalyptic number.

It is an amenable number.

6422187640 is an abundant number, since it is smaller than the sum of its proper divisors (9503980520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6422187640 is a wasteful number, since it uses less digits than its factorization.

6422187640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150592 (or 150588 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 6422187640 is about 80138.5527695628. The cubic root of 6422187640 is about 1858.7785984369.

Adding to 6422187640 its reverse (467812246), we get a palindrome (6889999886).

The spelling of 6422187640 in words is "six billion, four hundred twenty-two million, one hundred eighty-seven thousand, six hundred forty".