660460731 has 16 divisors (see below), whose sum is σ = 1007230464. Its totient is φ = 377100864.

The previous prime is 660460657. The next prime is 660460751. The reversal of 660460731 is 137064066.

It is not a de Polignac number, because 660460731 - 2²¹ = 658363579 is a prime.

It is a super-2 number, since 2×660460731² = 872416754386108722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 660460692 and 660460701.

It is not an unprimeable number, because it can be changed into a prime (660460751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15295 + ... + 39431.

It is an arithmetic number, because the mean of its divisors is an integer number (62951904).

Almost surely, 2^660460731 is an apocalyptic number.

660460731 is a deficient number, since it is larger than the sum of its proper divisors (346769733).

660460731 is a wasteful number, since it uses less digits than its factorization.

660460731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25450.

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 660460731 is about 25699.4305578937. The cubic root of 660460731 is about 870.8613176928.

The spelling of 660460731 in words is "six hundred sixty million, four hundred sixty thousand, seven hundred thirty-one".