27720797 has 8 divisors (see below), whose sum is σ = 30581880. Its totient is φ = 24963840.

The previous prime is 27720787. The next prime is 27720799. The reversal of 27720797 is 79702772.

It can be written as a sum of positive squares in 4 ways, for example, as 2208196 + 25512601 = 1486^2 + 5051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27720797 - 2²⁰ = 26672221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27720799) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25472 + ... + 26537.

It is an arithmetic number, because the mean of its divisors is an integer number (3822735).

Almost surely, 2^27720797 is an apocalyptic number.

It is an amenable number.

27720797 is a deficient number, since it is larger than the sum of its proper divisors (2861083).

27720797 is a wasteful number, since it uses less digits than its factorization.

27720797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52063.

The product of its (nonzero) digits is 86436, while the sum is 41.

The square root of 27720797 is about 5265.0543207074. The cubic root of 27720797 is about 302.6462084915.

The spelling of 27720797 in words is "twenty-seven million, seven hundred twenty thousand, seven hundred ninety-seven".