6623142640 has 40 divisors (see below), whose sum is σ = 15402192768. Its totient is φ = 2648674560.

The previous prime is 6623142619. The next prime is 6623142661. The reversal of 6623142640 is 462413266.

It is an interprime number because it is at equal distance from previous prime (6623142619) and next prime (6623142661).

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 6623142596 and 6623142605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704370 + ... + 713710.

Almost surely, 2^6623142640 is an apocalyptic number.

It is an amenable number.

6623142640 is an abundant number, since it is smaller than the sum of its proper divisors (8779050128).

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

6623142640 is a wasteful number, since it uses less digits than its factorization.

6623142640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18217 (or 18211 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 6623142640 is about 81382.6925089113. The cubic root of 6623142640 is about 1877.9673443557.

The spelling of 6623142640 in words is "six billion, six hundred twenty-three million, one hundred forty-two thousand, six hundred forty".