428379840 has 336 divisors, whose sum is σ = 1748527872. Its totient is φ = 97790976.

The previous prime is 428379827. The next prime is 428379863. The reversal of 428379840 is 48973824.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 543927 + ... + 544713.

It is an arithmetic number, because the mean of its divisors is an integer number (5203952).

Almost surely, 2^428379840 is an apocalyptic number.

428379840 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 428379840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874263936).

428379840 is an abundant number, since it is smaller than the sum of its proper divisors (1320148032).

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

428379840 is an equidigital number, since it uses as much as digits as its factorization.

428379840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 428379840 is about 20697.3389593928. The cubic root of 428379840 is about 753.8350761623.

The spelling of 428379840 in words is "four hundred twenty-eight million, three hundred seventy-nine thousand, eight hundred forty".