428817555 has 48 divisors (see below), whose sum is σ = 785790720. Its totient is φ = 215728704.

The previous prime is 428817547. The next prime is 428817559. The reversal of 428817555 is 555718824.

428817555 is a `hidden beast` number, since 4 + 2 + 88 + 17 + 555 = 666.

It is not a de Polignac number, because 428817555 - 2³ = 428817547 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 428817555.

It is not an unprimeable number, because it can be changed into a prime (428817559) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 223912 + ... + 225818.

It is an arithmetic number, because the mean of its divisors is an integer number (16370640).

Almost surely, 2^428817555 is an apocalyptic number.

428817555 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

428817555 is a deficient number, since it is larger than the sum of its proper divisors (356973165).

428817555 is a wasteful number, since it uses less digits than its factorization.

428817555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2200 (or 2197 counting only the distinct ones).

The product of its digits is 448000, while the sum is 45.

The square root of 428817555 is about 20707.9104450449. The cubic root of 428817555 is about 754.0917429240.

The spelling of 428817555 in words is "four hundred twenty-eight million, eight hundred seventeen thousand, five hundred fifty-five".