27861800440 has 32 divisors (see below), whose sum is σ = 62694006480. Its totient is φ = 11143839232.

The previous prime is 27861800413. The next prime is 27861800441. The reversal of 27861800440 is 4400816872.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 27861800393 and 27861800402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27861800441) 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, 770199 + ... + 805561.

Almost surely, 2^27861800440 is an apocalyptic number.

27861800440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27861800440 is an abundant number, since it is smaller than the sum of its proper divisors (34832206040).

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

27861800440 is a wasteful number, since it uses less digits than its factorization.

27861800440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55071 (or 55067 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 27861800440 in words is "twenty-seven billion, eight hundred sixty-one million, eight hundred thousand, four hundred forty".