428683638 has 8 divisors (see below), whose sum is σ = 857367288. Its totient is φ = 142894544.

The previous prime is 428683609. The next prime is 428683639. The reversal of 428683638 is 836386824.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

428683638 is an admirable number.

It is a super-2 number, since 2×428683638² = 367539322977830088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428683639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35723631 + ... + 35723642.

It is an arithmetic number, because the mean of its divisors is an integer number (107170911).

Almost surely, 2^428683638 is an apocalyptic number.

428683638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

428683638 is a wasteful number, since it uses less digits than its factorization.

428683638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71447278.

The product of its digits is 1327104, while the sum is 48.

The square root of 428683638 is about 20704.6767180751. The cubic root of 428683638 is about 754.0132353963.

The spelling of 428683638 in words is "four hundred twenty-eight million, six hundred eighty-three thousand, six hundred thirty-eight".