205139489280 has 480 divisors, whose sum is σ = 744201368064. Its totient is φ = 48119808000.

The previous prime is 205139489227. The next prime is 205139489287. The reversal of 205139489280 is 82984931502.

It is a tau number, because it is divible by the number of its divisors (480).

It is not an unprimeable number, because it can be changed into a prime (205139489287) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28804120 + ... + 28811240.

Almost surely, 2^205139489280 is an apocalyptic number.

205139489280 is a gapful number since it is divisible by the number (20) 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 205139489280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (372100684032).

205139489280 is an abundant number, since it is smaller than the sum of its proper divisors (539061878784).

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

205139489280 is a wasteful number, since it uses less digits than its factorization.

205139489280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7200 (or 7173 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 205139489280 in words is "two hundred five billion, one hundred thirty-nine million, four hundred eighty-nine thousand, two hundred eighty".