66870487 has 4 divisors (see below), whose sum is σ = 66888360. Its totient is φ = 66852616.

The previous prime is 66870451. The next prime is 66870497. The reversal of 66870487 is 78407866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66870487 - 2¹⁹ = 66346199 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 (66870497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 937 + ... + 11602.

It is an arithmetic number, because the mean of its divisors is an integer number (16722090).

Almost surely, 2^66870487 is an apocalyptic number.

66870487 is a deficient number, since it is larger than the sum of its proper divisors (17873).

66870487 is a wasteful number, since it uses less digits than its factorization.

66870487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17872.

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 66870487 is about 8177.4376793712. The cubic root of 66870487 is about 405.8929381126.

The spelling of 66870487 in words is "sixty-six million, eight hundred seventy thousand, four hundred eighty-seven".