428168587387 has 4 divisors (see below), whose sum is σ = 438125996440. Its totient is φ = 418211178336.

The previous prime is 428168587373. The next prime is 428168587403. The reversal of 428168587387 is 783785861824.

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 428168587387 - 2³⁵ = 393808849019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428168587337) 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, 4978704462 + ... + 4978704547.

It is an arithmetic number, because the mean of its divisors is an integer number (109531499110).

Almost surely, 2^428168587387 is an apocalyptic number.

428168587387 is a deficient number, since it is larger than the sum of its proper divisors (9957409053).

428168587387 is an equidigital number, since it uses as much as digits as its factorization.

428168587387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9957409052.

The product of its digits is 144506880, while the sum is 67.

The spelling of 428168587387 in words is "four hundred twenty-eight billion, one hundred sixty-eight million, five hundred eighty-seven thousand, three hundred eighty-seven".