7664981 has 4 divisors (see below), whose sum is σ = 7676172. Its totient is φ = 7653792.

The previous prime is 7664971. The next prime is 7664983. The reversal of 7664981 is 1894667.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7263025 + 401956 = 2695^2 + 634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7664981 is a prime.

It is a super-2 number, since 2×7664981² = 117503867460722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4496 + ... + 5961.

It is an arithmetic number, because the mean of its divisors is an integer number (1919043).

Almost surely, 2^7664981 is an apocalyptic number.

It is an amenable number.

7664981 is a deficient number, since it is larger than the sum of its proper divisors (11191).

7664981 is a wasteful number, since it uses less digits than its factorization.

7664981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11190.

The product of its digits is 72576, while the sum is 41.

The square root of 7664981 is about 2768.5702086095. The cubic root of 7664981 is about 197.1682707709.

The spelling of 7664981 in words is "seven million, six hundred sixty-four thousand, nine hundred eighty-one".