428738481 has 16 divisors (see below), whose sum is σ = 636155520. Its totient is φ = 285381360.

The previous prime is 428738459. The next prime is 428738483. The reversal of 428738481 is 184837824.

428738481 is a `hidden beast` number, since 428 + 73 + 84 + 81 = 666.

It is not a de Polignac number, because 428738481 - 2¹⁷ = 428607409 is a prime.

It is a super-2 number, since 2×428738481² = 367633370180374722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (428738483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5836 + ... + 29858.

It is an arithmetic number, because the mean of its divisors is an integer number (39759720).

Almost surely, 2^428738481 is an apocalyptic number.

It is an amenable number.

428738481 is a deficient number, since it is larger than the sum of its proper divisors (207417039).

428738481 is a wasteful number, since it uses less digits than its factorization.

428738481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24693 (or 24687 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 428738481 is about 20706.0010866415. The cubic root of 428738481 is about 754.0453885437.

Subtracting from 428738481 its sum of digits (45), we obtain a square (428738436 = 20706²).

The spelling of 428738481 in words is "four hundred twenty-eight million, seven hundred thirty-eight thousand, four hundred eighty-one".