27542436403638 has 32 divisors (see below), whose sum is σ = 59337293008896. Its totient is φ = 8472435488928.

The previous prime is 27542436403633. The next prime is 27542436403697. The reversal of 27542436403638 is 83630463424572.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27542436403633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44698870 + ... + 45310857.

It is an arithmetic number, because the mean of its divisors is an integer number (1854290406528).

Almost surely, 2^{27542436403638} is an apocalyptic number.

27542436403638 is an abundant number, since it is smaller than the sum of its proper divisors (31794856605258).

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

27542436403638 is a wasteful number, since it uses less digits than its factorization.

27542436403638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90013668.

The product of its (nonzero) digits is 69672960, while the sum is 57.

The spelling of 27542436403638 in words is "twenty-seven trillion, five hundred forty-two billion, four hundred thirty-six million, four hundred three thousand, six hundred thirty-eight".