7964236638 has 24 divisors (see below), whose sum is σ = 17474277600. Its totient is φ = 2621140704.

The previous prime is 7964236633. The next prime is 7964236711. The reversal of 7964236638 is 8366324697.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7964236633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2798943 + ... + 2801786.

It is an arithmetic number, because the mean of its divisors is an integer number (728094900).

Almost surely, 2^7964236638 is an apocalyptic number.

7964236638 is an abundant number, since it is smaller than the sum of its proper divisors (9510040962).

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

7964236638 is a wasteful number, since it uses less digits than its factorization.

7964236638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5600816 (or 5600813 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 54.

The square root of 7964236638 is about 89242.5718925671. The cubic root of 7964236638 is about 1997.0152677358.

The spelling of 7964236638 in words is "seven billion, nine hundred sixty-four million, two hundred thirty-six thousand, six hundred thirty-eight".