289139055640 has 128 divisors (see below), whose sum is σ = 682218028800. Its totient is φ = 110202227200.

The previous prime is 289139055607. The next prime is 289139055661. The reversal of 289139055640 is 46550931982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10367715 + ... + 10395565.

It is an arithmetic number, because the mean of its divisors is an integer number (5329828350).

Almost surely, 2^289139055640 is an apocalyptic number.

289139055640 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 289139055640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341109014400).

289139055640 is an abundant number, since it is smaller than the sum of its proper divisors (393078973160).

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

289139055640 is a wasteful number, since it uses less digits than its factorization.

289139055640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28057 (or 28053 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 289139055640 in words is "two hundred eighty-nine billion, one hundred thirty-nine million, fifty-five thousand, six hundred forty".