428133687 has 8 divisors (see below), whose sum is σ = 570973680. Its totient is φ = 285358080.

The previous prime is 428133679. The next prime is 428133703. The reversal of 428133687 is 786331824.

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

It is not a de Polignac number, because 428133687 - 2³ = 428133679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428133787) 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, 2487 + ... + 29367.

It is an arithmetic number, because the mean of its divisors is an integer number (71371710).

Almost surely, 2^428133687 is an apocalyptic number.

428133687 is a deficient number, since it is larger than the sum of its proper divisors (142839993).

428133687 is a wasteful number, since it uses less digits than its factorization.

428133687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32193.

The product of its digits is 193536, while the sum is 42.

The square root of 428133687 is about 20691.3916158387. The cubic root of 428133687 is about 753.6906604661.

The spelling of 428133687 in words is "four hundred twenty-eight million, one hundred thirty-three thousand, six hundred eighty-seven".