7661997 has 48 divisors (see below), whose sum is σ = 13752960. Its totient is φ = 4012416.

The previous prime is 7661993. The next prime is 7662001. The reversal of 7661997 is 7991667.

7661997 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (7661993) and next prime (7662001).

It is not a de Polignac number, because 7661997 - 2² = 7661993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661993) 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, 44203 + ... + 44375.

It is an arithmetic number, because the mean of its divisors is an integer number (286520).

Almost surely, 2^7661997 is an apocalyptic number.

It is an amenable number.

7661997 is a deficient number, since it is larger than the sum of its proper divisors (6090963).

7661997 is a wasteful number, since it uses less digits than its factorization.

7661997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 239 counting only the distinct ones).

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

The square root of 7661997 is about 2768.0312498236. The cubic root of 7661997 is about 197.1426813843.

The spelling of 7661997 in words is "seven million, six hundred sixty-one thousand, nine hundred ninety-seven".