428407640 has 32 divisors (see below), whose sum is σ = 967498560. Its totient is φ = 170726400.

The previous prime is 428407619. The next prime is 428407643. The reversal of 428407640 is 46704824.

It is a self number, because there is not a number n which added to its sum of digits gives 428407640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428407643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8921 + ... + 30600.

It is an arithmetic number, because the mean of its divisors is an integer number (30234330).

Almost surely, 2^428407640 is an apocalyptic number.

428407640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

428407640 is an abundant number, since it is smaller than the sum of its proper divisors (539090920).

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

428407640 is a wasteful number, since it uses less digits than its factorization.

428407640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39803 (or 39799 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 428407640 is about 20698.0105324159. The cubic root of 428407640 is about 753.8513826889.

The spelling of 428407640 in words is "four hundred twenty-eight million, four hundred seven thousand, six hundred forty".