428717997 has 6 divisors (see below), whose sum is σ = 619259342. Its totient is φ = 285811992.

The previous prime is 428717969. The next prime is 428718011. The reversal of 428717997 is 799717824.

It can be written as a sum of positive squares in only one way, i.e., 398840841 + 29877156 = 19971^2 + 5466^2 .

It is not a de Polignac number, because 428717997 - 2⁸ = 428717741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428712997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23817658 + ... + 23817675.

Almost surely, 2^428717997 is an apocalyptic number.

It is an amenable number.

428717997 is a deficient number, since it is larger than the sum of its proper divisors (190541345).

428717997 is a wasteful number, since it uses less digits than its factorization.

428717997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47635339 (or 47635336 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 54.

The square root of 428717997 is about 20705.5064415242. The cubic root of 428717997 is about 754.0333795822.

The spelling of 428717997 in words is "four hundred twenty-eight million, seven hundred seventeen thousand, nine hundred ninety-seven".