27780801372 has 36 divisors (see below), whose sum is σ = 72645201720. Its totient is φ = 8940947232.

The previous prime is 27780801371. The next prime is 27780801397. The reversal of 27780801372 is 27310808772.

It is a happy number.

27780801372 is a `hidden beast` number, since 277 + 8 + 0 + 8 + 0 + 1 + 372 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27780801371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13303938 + ... + 13306025.

It is an arithmetic number, because the mean of its divisors is an integer number (2017922270).

Almost surely, 2^27780801372 is an apocalyptic number.

It is an amenable number.

27780801372 is an abundant number, since it is smaller than the sum of its proper divisors (44864400348).

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

27780801372 is a wasteful number, since it uses less digits than its factorization.

27780801372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26610002 (or 26609997 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The spelling of 27780801372 in words is "twenty-seven billion, seven hundred eighty million, eight hundred one thousand, three hundred seventy-two".