428645587 has 4 divisors (see below), whose sum is σ = 442472896. Its totient is φ = 414818280.

The previous prime is 428645573. The next prime is 428645647. The reversal of 428645587 is 785546824.

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 428645587 - 2¹⁵ = 428612819 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 428645587.

It is not an unprimeable number, because it can be changed into a prime (428640587) 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, 6913608 + ... + 6913669.

It is an arithmetic number, because the mean of its divisors is an integer number (110618224).

Almost surely, 2^428645587 is an apocalyptic number.

428645587 is a deficient number, since it is larger than the sum of its proper divisors (13827309).

428645587 is a wasteful number, since it uses less digits than its factorization.

428645587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13827308.

The product of its digits is 2150400, while the sum is 49.

The square root of 428645587 is about 20703.7577990084. The cubic root of 428645587 is about 753.9909253880.

The spelling of 428645587 in words is "four hundred twenty-eight million, six hundred forty-five thousand, five hundred eighty-seven".