428020688 has 10 divisors (see below), whose sum is σ = 829290114. Its totient is φ = 214010336.

The previous prime is 428020687. The next prime is 428020693. The reversal of 428020688 is 886020824.

It can be written as a sum of positive squares in only one way, i.e., 261404224 + 166616464 = 16168^2 + 12908^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428020687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13375631 + ... + 13375662.

Almost surely, 2^428020688 is an apocalyptic number.

It is an amenable number.

428020688 is a deficient number, since it is larger than the sum of its proper divisors (401269426).

428020688 is a wasteful number, since it uses less digits than its factorization.

428020688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26751301 (or 26751295 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The square root of 428020688 is about 20688.6608556475. The cubic root of 428020688 is about 753.6243464561.

The spelling of 428020688 in words is "four hundred twenty-eight million, twenty thousand, six hundred eighty-eight".