428431820 has 24 divisors (see below), whose sum is σ = 905101344. Its totient is φ = 170345216.

The previous prime is 428431793. The next prime is 428431823. The reversal of 428431820 is 28134824.

It is not an unprimeable number, because it can be changed into a prime (428431823) 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, 60797 + ... + 67476.

It is an arithmetic number, because the mean of its divisors is an integer number (37712556).

Almost surely, 2^428431820 is an apocalyptic number.

It is an amenable number.

428431820 is an abundant number, since it is smaller than the sum of its proper divisors (476669524).

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

428431820 is a wasteful number, since it uses less digits than its factorization.

428431820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128449 (or 128447 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 428431820 is about 20698.5946382840. The cubic root of 428431820 is about 753.8655652740.

The spelling of 428431820 in words is "four hundred twenty-eight million, four hundred thirty-one thousand, eight hundred twenty".