7966638 has 24 divisors (see below), whose sum is σ = 17432688. Its totient is φ = 2629152.

The previous prime is 7966633. The next prime is 7966663. The reversal of 7966638 is 8366697.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7966593 and 7966602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7966633) 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, 295 + ... + 4002.

It is an arithmetic number, because the mean of its divisors is an integer number (726362).

Almost surely, 2^7966638 is an apocalyptic number.

7966638 is an abundant number, since it is smaller than the sum of its proper divisors (9466050).

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

7966638 is a wasteful number, since it uses less digits than its factorization.

7966638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4408 (or 4405 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 7966638 is about 2822.5233391418. The cubic root of 7966638 is about 199.7215959691.

The spelling of 7966638 in words is "seven million, nine hundred sixty-six thousand, six hundred thirty-eight".