428641287 has 4 divisors (see below), whose sum is σ = 571521720. Its totient is φ = 285760856.

The previous prime is 428641267. The next prime is 428641303. The reversal of 428641287 is 782146824.

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 428641287 - 2⁶ = 428641223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428641217) 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, 71440212 + ... + 71440217.

It is an arithmetic number, because the mean of its divisors is an integer number (142880430).

Almost surely, 2^428641287 is an apocalyptic number.

428641287 is a deficient number, since it is larger than the sum of its proper divisors (142880433).

428641287 is a wasteful number, since it uses less digits than its factorization.

428641287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142880432.

The product of its digits is 172032, while the sum is 42.

The square root of 428641287 is about 20703.6539528654. The cubic root of 428641287 is about 753.9884041351.

The spelling of 428641287 in words is "four hundred twenty-eight million, six hundred forty-one thousand, two hundred eighty-seven".