428643651 has 16 divisors (see below), whose sum is σ = 592232960. Its totient is φ = 275577120.

The previous prime is 428643641. The next prime is 428643653. The reversal of 428643651 is 156346824.

It is not a de Polignac number, because 428643651 - 2¹⁸ = 428381507 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428643653) 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 15 ways as a sum of consecutive naturals, for example, 10840 + ... + 31221.

It is an arithmetic number, because the mean of its divisors is an integer number (37014560).

Almost surely, 2^428643651 is an apocalyptic number.

428643651 is a deficient number, since it is larger than the sum of its proper divisors (163589309).

428643651 is a wasteful number, since it uses less digits than its factorization.

428643651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42186.

The product of its digits is 138240, while the sum is 39.

The square root of 428643651 is about 20703.7110441582. The cubic root of 428643651 is about 753.9897902400.

The spelling of 428643651 in words is "four hundred twenty-eight million, six hundred forty-three thousand, six hundred fifty-one".