666672072 has 32 divisors (see below), whose sum is σ = 1818197280. Its totient is φ = 202021760.

The previous prime is 666672067. The next prime is 666672077. The reversal of 666672072 is 270276666.

It is an interprime number because it is at equal distance from previous prime (666672067) and next prime (666672077).

It is not an unprimeable number, because it can be changed into a prime (666672077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1262373 + ... + 1262900.

It is an arithmetic number, because the mean of its divisors is an integer number (56818665).

Almost surely, 2^666672072 is an apocalyptic number.

It is an amenable number.

666672072 is an abundant number, since it is smaller than the sum of its proper divisors (1151525208).

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

666672072 is a wasteful number, since it uses less digits than its factorization.

666672072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525293 (or 2525289 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 42.

The square root of 666672072 is about 25819.9936483338. The cubic root of 666672072 is about 873.5828257267.

The spelling of 666672072 in words is "six hundred sixty-six million, six hundred seventy-two thousand, seventy-two".