27857138790 has 128 divisors (see below), whose sum is σ = 73084354560. Its totient is φ = 6754295808.

The previous prime is 27857138773. The next prime is 27857138801. The reversal of 27857138790 is 9783175872.

It is a self number, because there is not a number n which added to its sum of digits gives 27857138790.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17776587 + ... + 17778153.

It is an arithmetic number, because the mean of its divisors is an integer number (570971520).

Almost surely, 2^27857138790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27857138790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36542177280).

27857138790 is an abundant number, since it is smaller than the sum of its proper divisors (45227215770).

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

27857138790 is a wasteful number, since it uses less digits than its factorization.

27857138790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246.

The product of its (nonzero) digits is 5927040, while the sum is 57.

The spelling of 27857138790 in words is "twenty-seven billion, eight hundred fifty-seven million, one hundred thirty-eight thousand, seven hundred ninety".