428931665 has 8 divisors (see below), whose sum is σ = 526688448. Its totient is φ = 335165040.

The previous prime is 428931653. The next prime is 428931667. The reversal of 428931665 is 566139824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 428931665 - 2²² = 424737361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428931667) 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, 997301 + ... + 997730.

It is an arithmetic number, because the mean of its divisors is an integer number (65836056).

Almost surely, 2^428931665 is an apocalyptic number.

It is an amenable number.

428931665 is a deficient number, since it is larger than the sum of its proper divisors (97756783).

428931665 is a wasteful number, since it uses less digits than its factorization.

428931665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995079.

The product of its digits is 311040, while the sum is 44.

The square root of 428931665 is about 20710.6654890663. The cubic root of 428931665 is about 754.1586258957.

The spelling of 428931665 in words is "four hundred twenty-eight million, nine hundred thirty-one thousand, six hundred sixty-five".