61728812867 has 8 divisors (see below), whose sum is σ = 64547159040. Its totient is φ = 58921673800.

The previous prime is 61728812861. The next prime is 61728812911. The reversal of 61728812867 is 76821882716.

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 61728812867 - 2¹⁶ = 61728747331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61728812861) 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, 2790509 + ... + 2812542.

It is an arithmetic number, because the mean of its divisors is an integer number (8068394880).

Almost surely, 2^61728812867 is an apocalyptic number.

61728812867 is a deficient number, since it is larger than the sum of its proper divisors (2818346173).

61728812867 is a wasteful number, since it uses less digits than its factorization.

61728812867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603553.

The product of its digits is 3612672, while the sum is 56.

The spelling of 61728812867 in words is "sixty-one billion, seven hundred twenty-eight million, eight hundred twelve thousand, eight hundred sixty-seven".