428082640 has 40 divisors (see below), whose sum is σ = 1019575368. Its totient is φ = 167055360.

The previous prime is 428082581. The next prime is 428082679. The reversal of 428082640 is 46280824.

It can be written as a sum of positive squares in 4 ways, for example, as 10942864 + 417139776 = 3308^2 + 20424^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 428082596 and 428082605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61977 + ... + 68536.

Almost surely, 2^428082640 is an apocalyptic number.

428082640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

428082640 is an abundant number, since it is smaller than the sum of its proper divisors (591492728).

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

428082640 is a wasteful number, since it uses less digits than its factorization.

428082640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130567 (or 130561 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

The square root of 428082640 is about 20690.1580467622. The cubic root of 428082640 is about 753.6607047323.

The spelling of 428082640 in words is "four hundred twenty-eight million, eighty-two thousand, six hundred forty".