61727905 has 4 divisors (see below), whose sum is σ = 74073492. Its totient is φ = 49382320.

The previous prime is 61727893. The next prime is 61727909. The reversal of 61727905 is 50972716.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19633761 + 42094144 = 4431^2 + 6488^2 .

It is not a de Polignac number, because 61727905 - 2⁷ = 61727777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61727909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6172786 + ... + 6172795.

It is an arithmetic number, because the mean of its divisors is an integer number (18518373).

Almost surely, 2^61727905 is an apocalyptic number.

It is an amenable number.

61727905 is a deficient number, since it is larger than the sum of its proper divisors (12345587).

61727905 is a wasteful number, since it uses less digits than its factorization.

61727905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12345586.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 61727905 is about 7856.7108257845. The cubic root of 61727905 is about 395.2093213044.

The spelling of 61727905 in words is "sixty-one million, seven hundred twenty-seven thousand, nine hundred five".