428631587 has 8 divisors (see below), whose sum is σ = 438263616. Its totient is φ = 419020992.

The previous prime is 428631563. The next prime is 428631601. The reversal of 428631587 is 785136824.

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 428631587 - 2¹⁸ = 428369443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428633587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39173 + ... + 48905.

It is an arithmetic number, because the mean of its divisors is an integer number (54782952).

Almost surely, 2^428631587 is an apocalyptic number.

428631587 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

428631587 is a deficient number, since it is larger than the sum of its proper divisors (9632029).

428631587 is an equidigital number, since it uses as much as digits as its factorization.

428631587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10717.

The product of its digits is 322560, while the sum is 44.

The square root of 428631587 is about 20703.4196933743. The cubic root of 428631587 is about 753.9827165957.

The spelling of 428631587 in words is "four hundred twenty-eight million, six hundred thirty-one thousand, five hundred eighty-seven".