27861800438 has 4 divisors (see below), whose sum is σ = 41792700660. Its totient is φ = 13930900218.

The previous prime is 27861800413. The next prime is 27861800441. The reversal of 27861800438 is 83400816872.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 27861800392 and 27861800401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6965450108 + ... + 6965450111.

It is an arithmetic number, because the mean of its divisors is an integer number (10448175165).

Almost surely, 2^27861800438 is an apocalyptic number.

27861800438 is a deficient number, since it is larger than the sum of its proper divisors (13930900222).

27861800438 is a wasteful number, since it uses less digits than its factorization.

27861800438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13930900221.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 27861800438 in words is "twenty-seven billion, eight hundred sixty-one million, eight hundred thousand, four hundred thirty-eight".