209742125280 has 48 divisors (see below), whose sum is σ = 660687696144. Its totient is φ = 55931233280.

The previous prime is 209742125261. The next prime is 209742125287. The reversal of 209742125280 is 82521247902.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209742125287) 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, 218480901 + ... + 218481860.

It is an arithmetic number, because the mean of its divisors is an integer number (13764327003).

Almost surely, 2^209742125280 is an apocalyptic number.

209742125280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209742125280 is an abundant number, since it is smaller than the sum of its proper divisors (450945570864).

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

209742125280 is a wasteful number, since it uses less digits than its factorization.

209742125280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436962779 (or 436962771 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 209742125280 in words is "two hundred nine billion, seven hundred forty-two million, one hundred twenty-five thousand, two hundred eighty".