6660731 has 16 divisors (see below), whose sum is σ = 8667648. Its totient is φ = 4963200.

The previous prime is 6660721. The next prime is 6660733. The reversal of 6660731 is 1370666.

It is a happy number.

It is not a de Polignac number, because 6660731 - 2²² = 2466427 is a prime.

It is a super-2 number, since 2×6660731² = 88730674908722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6660694 and 6660703.

It is not an unprimeable number, because it can be changed into a prime (6660733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110 + ... + 3651.

It is an arithmetic number, because the mean of its divisors is an integer number (541728).

Almost surely, 2^6660731 is an apocalyptic number.

6660731 is a deficient number, since it is larger than the sum of its proper divisors (2006917).

6660731 is a wasteful number, since it uses less digits than its factorization.

6660731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3802.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 6660731 is about 2580.8392045999. The cubic root of 6660731 is about 188.1513324288.

The spelling of 6660731 in words is "six million, six hundred sixty thousand, seven hundred thirty-one".