428381280 has 72 divisors (see below), whose sum is σ = 1461856032. Its totient is φ = 114234624.

The previous prime is 428381267. The next prime is 428381293. The reversal of 428381280 is 82183824.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (428381267) and next prime (428381293).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147304 + ... + 150183.

It is an arithmetic number, because the mean of its divisors is an integer number (20303556).

Almost surely, 2^428381280 is an apocalyptic number.

428381280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

428381280 is an abundant number, since it is smaller than the sum of its proper divisors (1033474752).

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

428381280 is a wasteful number, since it uses less digits than its factorization.

428381280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297508 (or 297497 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 428381280 is about 20697.3737464443. The cubic root of 428381280 is about 753.8359208342.

The spelling of 428381280 in words is "four hundred twenty-eight million, three hundred eighty-one thousand, two hundred eighty".