27445578635640 has 128 divisors (see below), whose sum is σ = 90146161681920. Its totient is φ = 6629453760000.

The previous prime is 27445578635621. The next prime is 27445578635663. The reversal of 27445578635640 is 4653687554472.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37165236 + ... + 37896515.

It is an arithmetic number, because the mean of its divisors is an integer number (704266888140).

Almost surely, 2^{27445578635640} is an apocalyptic number.

27445578635640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27445578635640 is an abundant number, since it is smaller than the sum of its proper divisors (62700583046280).

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

27445578635640 is a wasteful number, since it uses less digits than its factorization.

27445578635640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75062053 (or 75062049 counting only the distinct ones).

The product of its (nonzero) digits is 677376000, while the sum is 66.

The spelling of 27445578635640 in words is "twenty-seven trillion, four hundred forty-five billion, five hundred seventy-eight million, six hundred thirty-five thousand, six hundred forty".