7997661 has 48 divisors (see below), whose sum is σ = 14037504. Its totient is φ = 4292352.

The previous prime is 7997623. The next prime is 7997663. The reversal of 7997661 is 1667997.

7997661 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7997661 - 2¹³ = 7989469 is a prime.

7997661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7997663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109521 + ... + 109593.

It is an arithmetic number, because the mean of its divisors is an integer number (292448).

Almost surely, 2^7997661 is an apocalyptic number.

It is an amenable number.

7997661 is a deficient number, since it is larger than the sum of its proper divisors (6039843).

7997661 is a wasteful number, since it uses less digits than its factorization.

7997661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 167 counting only the distinct ones).

The product of its digits is 142884, while the sum is 45.

The square root of 7997661 is about 2828.0136138286. The cubic root of 7997661 is about 199.9805064334.

The spelling of 7997661 in words is "seven million, nine hundred ninety-seven thousand, six hundred sixty-one".