208416774820 has 24 divisors (see below), whose sum is σ = 447853722624. Its totient is φ = 81427948896.

The previous prime is 208416774749. The next prime is 208416774821. The reversal of 208416774820 is 28477614802.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (208416774821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121171684 + ... + 121173403.

It is an arithmetic number, because the mean of its divisors is an integer number (18660571776).

Almost surely, 2^208416774820 is an apocalyptic number.

208416774820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208416774820 is an abundant number, since it is smaller than the sum of its proper divisors (239436947804).

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

208416774820 is a wasteful number, since it uses less digits than its factorization.

208416774820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242345139 (or 242345137 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 49.

The spelling of 208416774820 in words is "two hundred eight billion, four hundred sixteen million, seven hundred seventy-four thousand, eight hundred twenty".