428139980 has 12 divisors (see below), whose sum is σ = 899094000. Its totient is φ = 171255984.

The previous prime is 428139953. The next prime is 428140001. The reversal of 428139980 is 89931824.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10703480 + ... + 10703519.

It is an arithmetic number, because the mean of its divisors is an integer number (74924500).

Almost surely, 2^428139980 is an apocalyptic number.

It is an amenable number.

428139980 is an abundant number, since it is smaller than the sum of its proper divisors (470954020).

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

428139980 is a wasteful number, since it uses less digits than its factorization.

428139980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21407008 (or 21407006 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 428139980 is about 20691.5436833505. The cubic root of 428139980 is about 753.6943532006.

The spelling of 428139980 in words is "four hundred twenty-eight million, one hundred thirty-nine thousand, nine hundred eighty".