66870407 has 8 divisors (see below), whose sum is σ = 69945984. Its totient is φ = 63808888.

The previous prime is 66870403. The next prime is 66870421. The reversal of 66870407 is 70407866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66870407 - 2² = 66870403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66870403) 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, 6908 + ... + 13470.

It is an arithmetic number, because the mean of its divisors is an integer number (8743248).

Almost surely, 2^66870407 is an apocalyptic number.

66870407 is a deficient number, since it is larger than the sum of its proper divisors (3075577).

66870407 is a wasteful number, since it uses less digits than its factorization.

66870407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7029.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 66870407 is about 8177.4327878620. The cubic root of 66870407 is about 405.8927762503.

The spelling of 66870407 in words is "sixty-six million, eight hundred seventy thousand, four hundred seven".