27780444575 has 12 divisors (see below), whose sum is σ = 37097578728. Its totient is φ = 20514789600.

The previous prime is 27780444553. The next prime is 27780444577. The reversal of 27780444575 is 57544408772.

It is a happy number.

It is not a de Polignac number, because 27780444575 - 2²⁰ = 27779395999 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27780444577) 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, 42738821 + ... + 42739470.

It is an arithmetic number, because the mean of its divisors is an integer number (3091464894).

Almost surely, 2^27780444575 is an apocalyptic number.

27780444575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27780444575 is a deficient number, since it is larger than the sum of its proper divisors (9317134153).

27780444575 is a wasteful number, since it uses less digits than its factorization.

27780444575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85478314 (or 85478309 counting only the distinct ones).

The product of its (nonzero) digits is 8780800, while the sum is 53.

The spelling of 27780444575 in words is "twenty-seven billion, seven hundred eighty million, four hundred forty-four thousand, five hundred seventy-five".