428857840 has 20 divisors (see below), whose sum is σ = 997094664. Its totient is φ = 171543104.

The previous prime is 428857811. The next prime is 428857841. The reversal of 428857840 is 48758824.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428857841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2680282 + ... + 2680441.

Almost surely, 2^428857840 is an apocalyptic number.

428857840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

428857840 is an abundant number, since it is smaller than the sum of its proper divisors (568236824).

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

428857840 is a wasteful number, since it uses less digits than its factorization.

428857840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5360736 (or 5360730 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 46.

The square root of 428857840 is about 20708.8831181211. The cubic root of 428857840 is about 754.1153564120.

It can be divided in two parts, 4288 and 57840, that added together give a triangular number (62128 = T₃₅₂).

The spelling of 428857840 in words is "four hundred twenty-eight million, eight hundred fifty-seven thousand, eight hundred forty".