208783428 has 48 divisors (see below), whose sum is σ = 561168384. Its totient is φ = 59179680.

The previous prime is 208783423. The next prime is 208783451. The reversal of 208783428 is 824387802.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 208783428.

It is not an unprimeable number, because it can be changed into a prime (208783423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 883 + ... + 20453.

It is an arithmetic number, because the mean of its divisors is an integer number (11691008).

Almost surely, 2^208783428 is an apocalyptic number.

208783428 is a gapful number since it is divisible by the number (28) 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 208783428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280584192).

208783428 is an abundant number, since it is smaller than the sum of its proper divisors (352384956).

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

208783428 is a wasteful number, since it uses less digits than its factorization.

208783428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19712 (or 19710 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 42.

The square root of 208783428 is about 14449.3400541340. The cubic root of 208783428 is about 593.2421606603.

The spelling of 208783428 in words is "two hundred eight million, seven hundred eighty-three thousand, four hundred twenty-eight".