66870406 has 4 divisors (see below), whose sum is σ = 100305612. Its totient is φ = 33435202.

The previous prime is 66870403. The next prime is 66870421. The reversal of 66870406 is 60407866.

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

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 as a sum of consecutive naturals, namely, 16717600 + ... + 16717603.

It is an arithmetic number, because the mean of its divisors is an integer number (25076403).

Almost surely, 2^66870406 is an apocalyptic number.

66870406 is a deficient number, since it is larger than the sum of its proper divisors (33435206).

66870406 is a wasteful number, since it uses less digits than its factorization.

66870406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33435205.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 66870406 is about 8177.4327267181. The cubic root of 66870406 is about 405.8927742270.

It can be divided in two parts, 66870 and 406, that added together give a palindrome (67276).

The spelling of 66870406 in words is "sixty-six million, eight hundred seventy thousand, four hundred six".