428787121 has 8 divisors (see below), whose sum is σ = 493620480. Its totient is φ = 364848288.

The previous prime is 428787113. The next prime is 428787187. The reversal of 428787121 is 121787824.

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

It is not a de Polignac number, because 428787121 - 2³ = 428787113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428788121) 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, 222601 + ... + 224518.

It is an arithmetic number, because the mean of its divisors is an integer number (61702560).

Almost surely, 2^428787121 is an apocalyptic number.

It is an amenable number.

428787121 is a deficient number, since it is larger than the sum of its proper divisors (64833359).

428787121 is a wasteful number, since it uses less digits than its factorization.

428787121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447263.

The product of its digits is 50176, while the sum is 40.

The square root of 428787121 is about 20707.1755920502. The cubic root of 428787121 is about 754.0739027254.

The spelling of 428787121 in words is "four hundred twenty-eight million, seven hundred eighty-seven thousand, one hundred twenty-one".