27720425 has 6 divisors (see below), whose sum is σ = 34373358. Its totient is φ = 22176320.

The previous prime is 27720419. The next prime is 27720467. The reversal of 27720425 is 52402772.

It can be written as a sum of positive squares in 3 ways, for example, as 2399401 + 25321024 = 1549^2 + 5032^2 .

It is not a de Polignac number, because 27720425 - 2⁴ = 27720409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 554384 + ... + 554433.

It is an arithmetic number, because the mean of its divisors is an integer number (5728893).

Almost surely, 2^27720425 is an apocalyptic number.

27720425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27720425 is a deficient number, since it is larger than the sum of its proper divisors (6652933).

27720425 is a wasteful number, since it uses less digits than its factorization.

27720425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108827 (or 1108822 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 27720425 is about 5265.0189933181. The cubic root of 27720425 is about 302.6448546957.

It can be divided in two parts, 277 and 20425, that added together give a palindrome (20702).

The spelling of 27720425 in words is "twenty-seven million, seven hundred twenty thousand, four hundred twenty-five".