428566646 has 4 divisors (see below), whose sum is σ = 642849972. Its totient is φ = 214283322.

The previous prime is 428566643. The next prime is 428566657. The reversal of 428566646 is 646665824.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 428566646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428566643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107141660 + ... + 107141663.

It is an arithmetic number, because the mean of its divisors is an integer number (160712493).

Almost surely, 2^428566646 is an apocalyptic number.

428566646 is a deficient number, since it is larger than the sum of its proper divisors (214283326).

428566646 is a wasteful number, since it uses less digits than its factorization.

428566646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214283325.

The product of its digits is 1658880, while the sum is 47.

The square root of 428566646 is about 20701.8512698744. The cubic root of 428566646 is about 753.9446366018.

The spelling of 428566646 in words is "four hundred twenty-eight million, five hundred sixty-six thousand, six hundred forty-six".