428621387 has 8 divisors (see below), whose sum is σ = 431781504. Its totient is φ = 425472768.

The previous prime is 428621359. The next prime is 428621429. The reversal of 428621387 is 783126824.

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 428621387 - 2²⁰ = 427572811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428621327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80603 + ... + 85755.

It is an arithmetic number, because the mean of its divisors is an integer number (53972688).

Almost surely, 2^428621387 is an apocalyptic number.

428621387 is a deficient number, since it is larger than the sum of its proper divisors (3160117).

428621387 is a wasteful number, since it uses less digits than its factorization.

428621387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749.

The product of its digits is 129024, while the sum is 41.

The square root of 428621387 is about 20703.1733557926. The cubic root of 428621387 is about 753.9767357915.

The spelling of 428621387 in words is "four hundred twenty-eight million, six hundred twenty-one thousand, three hundred eighty-seven".