208081540 has 24 divisors (see below), whose sum is σ = 459970560. Its totient is φ = 78851808.

The previous prime is 208081507. The next prime is 208081561. The reversal of 208081540 is 45180802.

It is a junction number, because it is equal to n+sod(n) for n = 208081499 and 208081508.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 273412 + ... + 274171.

It is an arithmetic number, because the mean of its divisors is an integer number (19165440).

Almost surely, 2^208081540 is an apocalyptic number.

208081540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

208081540 is an abundant number, since it is smaller than the sum of its proper divisors (251889020).

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

208081540 is a wasteful number, since it uses less digits than its factorization.

208081540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547611 (or 547609 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 208081540 is about 14425.0317157364. The cubic root of 208081540 is about 592.5766272618.

The spelling of 208081540 in words is "two hundred eight million, eighty-one thousand, five hundred forty".