428081280 has 128 divisors (see below), whose sum is σ = 1488628800. Its totient is φ = 103772160.

The previous prime is 428081257. The next prime is 428081351. The reversal of 428081280 is 82180824.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10986 + ... + 31254.

Almost surely, 2^428081280 is an apocalyptic number.

428081280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 428081280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744314400).

428081280 is an abundant number, since it is smaller than the sum of its proper divisors (1060547520).

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

428081280 is a wasteful number, since it uses less digits than its factorization.

428081280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20302 (or 20290 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 428081280 is about 20690.1251808683. The cubic root of 428081280 is about 753.6599066156.

The spelling of 428081280 in words is "four hundred twenty-eight million, eighty-one thousand, two hundred eighty".