66872429 has 8 divisors (see below), whose sum is σ = 73237920. Its totient is φ = 60681456.

The previous prime is 66872413. The next prime is 66872447. The reversal of 66872429 is 92427866.

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 66872429 - 2⁴ = 66872413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66872429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66872129) 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, 42827 + ... + 44360.

It is an arithmetic number, because the mean of its divisors is an integer number (9154740).

Almost surely, 2^66872429 is an apocalyptic number.

It is an amenable number.

66872429 is a deficient number, since it is larger than the sum of its proper divisors (6365491).

66872429 is a wasteful number, since it uses less digits than its factorization.

66872429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87259.

The product of its digits is 290304, while the sum is 44.

The square root of 66872429 is about 8177.5564198604. The cubic root of 66872429 is about 405.8968672823.

The spelling of 66872429 in words is "sixty-six million, eight hundred seventy-two thousand, four hundred twenty-nine".