428915784 has 32 divisors (see below), whose sum is σ = 1169771040. Its totient is φ = 129974400.

The previous prime is 428915777. The next prime is 428915789. The reversal of 428915784 is 487519824.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (428915789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 812077 + ... + 812604.

It is an arithmetic number, because the mean of its divisors is an integer number (36555345).

Almost surely, 2^428915784 is an apocalyptic number.

428915784 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

428915784 is an abundant number, since it is smaller than the sum of its proper divisors (740855256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

428915784 is a wasteful number, since it uses less digits than its factorization.

428915784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624701 (or 1624697 counting only the distinct ones).

The product of its digits is 645120, while the sum is 48.

The square root of 428915784 is about 20710.2820840277. The cubic root of 428915784 is about 754.1493183207.

The spelling of 428915784 in words is "four hundred twenty-eight million, nine hundred fifteen thousand, seven hundred eighty-four".