428908905 has 32 divisors (see below), whose sum is σ = 765726720. Its totient is φ = 227784960.

The previous prime is 428908903. The next prime is 428908943. The reversal of 428908905 is 509809824.

It is not a de Polignac number, because 428908905 - 2¹ = 428908903 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (428908903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25944 + ... + 39126.

It is an arithmetic number, because the mean of its divisors is an integer number (23928960).

Almost surely, 2^428908905 is an apocalyptic number.

428908905 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

428908905 is a deficient number, since it is larger than the sum of its proper divisors (336817815).

428908905 is a wasteful number, since it uses less digits than its factorization.

428908905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13438 (or 13432 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 428908905 is about 20710.1160064351. The cubic root of 428908905 is about 754.1452865884.

The spelling of 428908905 in words is "four hundred twenty-eight million, nine hundred eight thousand, nine hundred five".