27781528245 has 16 divisors (see below), whose sum is σ = 44459617920. Its totient is φ = 14813757504.

The previous prime is 27781528211. The next prime is 27781528253. The reversal of 27781528245 is 54282518772.

It is not a de Polignac number, because 27781528245 - 2¹² = 27781524149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115009 + ... + 262278.

It is an arithmetic number, because the mean of its divisors is an integer number (2778726120).

Almost surely, 2^27781528245 is an apocalyptic number.

It is an amenable number.

27781528245 is a deficient number, since it is larger than the sum of its proper divisors (16678089675).

27781528245 is a wasteful number, since it uses less digits than its factorization.

27781528245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382204.

The product of its digits is 2508800, while the sum is 51.

The spelling of 27781528245 in words is "twenty-seven billion, seven hundred eighty-one million, five hundred twenty-eight thousand, two hundred forty-five".