428161768 has 8 divisors (see below), whose sum is σ = 802803330. Its totient is φ = 214080880.

The previous prime is 428161763. The next prime is 428161787. The reversal of 428161768 is 867161824.

It can be written as a sum of positive squares in only one way, i.e., 389746564 + 38415204 = 19742^2 + 6198^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (428161763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26760103 + ... + 26760118.

Almost surely, 2^428161768 is an apocalyptic number.

It is an amenable number.

428161768 is a deficient number, since it is larger than the sum of its proper divisors (374641562).

428161768 is a wasteful number, since it uses less digits than its factorization.

428161768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53520227 (or 53520223 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 428161768 is about 20692.0701719282. The cubic root of 428161768 is about 753.7071381267.

It can be divided in two parts, 4281 and 61768, that added together give a square (66049 = 257²).

The spelling of 428161768 in words is "four hundred twenty-eight million, one hundred sixty-one thousand, seven hundred sixty-eight".