69727561 has 4 divisors (see below), whose sum is σ = 69796224. Its totient is φ = 69658900.

The previous prime is 69727529. The next prime is 69727583. The reversal of 69727561 is 16572796.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 69727561 - 2⁵ = 69727529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69727661) 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, 32785 + ... + 34846.

It is an arithmetic number, because the mean of its divisors is an integer number (17449056).

Almost surely, 2^69727561 is an apocalyptic number.

It is an amenable number.

69727561 is a deficient number, since it is larger than the sum of its proper divisors (68663).

69727561 is a wasteful number, since it uses less digits than its factorization.

69727561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68662.

The product of its digits is 158760, while the sum is 43.

The square root of 69727561 is about 8350.3030483929. The cubic root of 69727561 is about 411.5931687225.

The spelling of 69727561 in words is "sixty-nine million, seven hundred twenty-seven thousand, five hundred sixty-one".