66868072 has 16 divisors (see below), whose sum is σ = 132753060. Its totient is φ = 31467264.

The previous prime is 66868057. The next prime is 66868091. The reversal of 66868072 is 27086866.

It can be written as a sum of positive squares in 2 ways, for example, as 64224196 + 2643876 = 8014^2 + 1626^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245703 + ... + 245974.

Almost surely, 2^66868072 is an apocalyptic number.

It is an amenable number.

66868072 is a deficient number, since it is larger than the sum of its proper divisors (65884988).

66868072 is a wasteful number, since it uses less digits than its factorization.

66868072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491700 (or 491696 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 66868072 is about 8177.2900156470. The cubic root of 66868072 is about 405.8880518353. Note that the first 3 decimals are identical.

The spelling of 66868072 in words is "sixty-six million, eight hundred sixty-eight thousand, seventy-two".