428158640 has 160 divisors (see below), whose sum is σ = 1239254016. Its totient is φ = 133954560.

The previous prime is 428158631. The next prime is 428158663. The reversal of 428158640 is 46851824.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 428158594 and 428158603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 749555 + ... + 750125.

Almost surely, 2^428158640 is an apocalyptic number.

428158640 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 428158640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (619627008).

428158640 is an abundant number, since it is smaller than the sum of its proper divisors (811095376).

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

428158640 is a wasteful number, since it uses less digits than its factorization.

428158640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 428158640 is about 20691.9945872794. The cubic root of 428158640 is about 753.7053026821.

The spelling of 428158640 in words is "four hundred twenty-eight million, one hundred fifty-eight thousand, six hundred forty".