27858709078225 has 27 divisors (see below), whose sum is σ = 35409280762641. Its totient is φ = 21742538193600.

The previous prime is 27858709078097. The next prime is 27858709078253. The reversal of 27858709078225 is 52287090785872.

The square root of 27858709078225 is 5278135.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 11726179771201 + 16132529307024 = 3424351^2 + 4016532^2 .

It is not a de Polignac number, because 27858709078225 - 2⁷ = 27858709078097 is a prime.

It is a super-2 number, since 2×27858709078225² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1082004802 + ... + 1082030548.

Almost surely, 2^{27858709078225} is an apocalyptic number.

27858709078225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

27858709078225 is the 5278135-th square number.

27858709078225 is the 2639068-th centered octagonal number.

It is an amenable number.

27858709078225 is a deficient number, since it is larger than the sum of its proper divisors (7550571684416).

27858709078225 is an frugal number, since it uses more digits than its factorization.

27858709078225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51586 (or 25793 counting only the distinct ones).

The product of its (nonzero) digits is 316108800, while the sum is 70.

The spelling of 27858709078225 in words is "twenty-seven trillion, eight hundred fifty-eight billion, seven hundred nine million, seventy-eight thousand, two hundred twenty-five".