428628387 has 16 divisors (see below), whose sum is σ = 640311552. Its totient is φ = 252753120.

The previous prime is 428628383. The next prime is 428628401. The reversal of 428628387 is 783826824.

It is a happy number.

It is not a de Polignac number, because 428628387 - 2² = 428628383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428628383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174303 + ... + 176744.

It is an arithmetic number, because the mean of its divisors is an integer number (40019472).

Almost surely, 2^428628387 is an apocalyptic number.

428628387 is a deficient number, since it is larger than the sum of its proper divisors (211683165).

428628387 is a wasteful number, since it uses less digits than its factorization.

428628387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351098.

The product of its digits is 1032192, while the sum is 48.

The square root of 428628387 is about 20703.3424113113. The cubic root of 428628387 is about 753.9808402752.

The spelling of 428628387 in words is "four hundred twenty-eight million, six hundred twenty-eight thousand, three hundred eighty-seven".