428915772 has 18 divisors (see below), whose sum is σ = 1084203848. Its totient is φ = 142971912.

The previous prime is 428915761. The next prime is 428915777. The reversal of 428915772 is 277519824.

It is a happy number.

428915772 is a `hidden beast` number, since 428 + 9 + 157 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428915777) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5957128 + ... + 5957199.

Almost surely, 2^428915772 is an apocalyptic number.

It is an amenable number.

428915772 is an abundant number, since it is smaller than the sum of its proper divisors (655288076).

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

428915772 is a wasteful number, since it uses less digits than its factorization.

428915772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11914337 (or 11914332 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 428915772 is about 20710.2817943166. The cubic root of 428915772 is about 754.1493112876.

The spelling of 428915772 in words is "four hundred twenty-eight million, nine hundred fifteen thousand, seven hundred seventy-two".