666739240 has 32 divisors (see below), whose sum is σ = 1510245000. Its totient is φ = 264903424.

The previous prime is 666739237. The next prime is 666739243. The reversal of 666739240 is 42937666.

666739240 is digitally balanced in base 2, 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 (666739237) and next prime (666739243).

It can be written as a sum of positive squares in 4 ways, for example, as 154803364 + 511935876 = 12442^2 + 22626^2 .

It is not an unprimeable number, because it can be changed into a prime (666739243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49975 + ... + 61894.

Almost surely, 2^666739240 is an apocalyptic number.

It is an amenable number.

666739240 is an abundant number, since it is smaller than the sum of its proper divisors (843505760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666739240 is a wasteful number, since it uses less digits than its factorization.

666739240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112029 (or 112025 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 666739240 is about 25821.2943130278. The cubic root of 666739240 is about 873.6121629092.

The spelling of 666739240 in words is "six hundred sixty-six million, seven hundred thirty-nine thousand, two hundred forty".