66870992 has 10 divisors (see below), whose sum is σ = 129562578. Its totient is φ = 33435488.

The previous prime is 66870971. The next prime is 66870997. The reversal of 66870992 is 29907866.

It can be written as a sum of positive squares in only one way, i.e., 63616576 + 3254416 = 7976^2 + 1804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66870997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2089703 + ... + 2089734.

Almost surely, 2^66870992 is an apocalyptic number.

It is an amenable number.

66870992 is a deficient number, since it is larger than the sum of its proper divisors (62691586).

66870992 is a wasteful number, since it uses less digits than its factorization.

66870992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4179445 (or 4179439 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 66870992 is about 8177.4685569558. The cubic root of 66870992 is about 405.8939598659.

The spelling of 66870992 in words is "sixty-six million, eight hundred seventy thousand, nine hundred ninety-two".