27871851900 has 72 divisors (see below), whose sum is σ = 85386253680. Its totient is φ = 6995287040.

The previous prime is 27871851899. The next prime is 27871851901. The reversal of 27871851900 is 915817872.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (27871851899) and next prime (27871851901).

It is a super-2 number, since 2×27871851900² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27871851900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27871851901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2727435 + ... + 2737634.

It is an arithmetic number, because the mean of its divisors is an integer number (1185920190).

Almost surely, 2^27871851900 is an apocalyptic number.

27871851900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27871851900 is an abundant number, since it is smaller than the sum of its proper divisors (57514401780).

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

27871851900 is a wasteful number, since it uses less digits than its factorization.

27871851900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5465103 (or 5465096 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 48.

The spelling of 27871851900 in words is "twenty-seven billion, eight hundred seventy-one million, eight hundred fifty-one thousand, nine hundred".