7666731 has 10 divisors (see below), whose sum is σ = 11452892. Its totient is φ = 5111100.

The previous prime is 7666717. The next prime is 7666741. The reversal of 7666731 is 1376667.

It is not a de Polignac number, because 7666731 - 2⁵ = 7666699 is a prime.

It is a super-2 number, since 2×7666731² = 117557528452722, which contains 22 as substring.

It is a Duffinian number.

7666731 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7666741) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 47245 + ... + 47406.

Almost surely, 2^7666731 is an apocalyptic number.

7666731 is a deficient number, since it is larger than the sum of its proper divisors (3786161).

7666731 is an equidigital number, since it uses as much as digits as its factorization.

7666731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94663 (or 94654 counting only the distinct ones).

The product of its digits is 31752, while the sum is 36.

The square root of 7666731 is about 2768.8862381831. The cubic root of 7666731 is about 197.1832748619.

Subtracting from 7666731 its reverse (1376667), we obtain a square (6290064 = 2508²).

The spelling of 7666731 in words is "seven million, six hundred sixty-six thousand, seven hundred thirty-one".