7997647 has 8 divisors (see below), whose sum is σ = 9313056. Its totient is φ = 6725472.

The previous prime is 7997623. The next prime is 7997663. The reversal of 7997647 is 7467997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7997647 - 2⁷ = 7997519 is a prime.

It is a Duffinian number.

7997647 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7997647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7997677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10408 + ... + 11149.

It is an arithmetic number, because the mean of its divisors is an integer number (1164132).

Almost surely, 2^7997647 is an apocalyptic number.

7997647 is a deficient number, since it is larger than the sum of its proper divisors (1315409).

7997647 is a wasteful number, since it uses less digits than its factorization.

7997647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21617.

The product of its digits is 666792, while the sum is 49.

The square root of 7997647 is about 2828.0111385919. The cubic root of 7997647 is about 199.9803897439.

The spelling of 7997647 in words is "seven million, nine hundred ninety-seven thousand, six hundred forty-seven".