61279765 has 4 divisors (see below), whose sum is σ = 73535724. Its totient is φ = 49023808.

The previous prime is 61279711. The next prime is 61279811. The reversal of 61279765 is 56797216.

61279765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 23444964 + 37834801 = 4842^2 + 6151^2 .

It is a cyclic number.

It is not a de Polignac number, because 61279765 - 2²⁵ = 27725333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6127972 + ... + 6127981.

It is an arithmetic number, because the mean of its divisors is an integer number (18383931).

Almost surely, 2^61279765 is an apocalyptic number.

It is an amenable number.

61279765 is a deficient number, since it is larger than the sum of its proper divisors (12255959).

61279765 is a wasteful number, since it uses less digits than its factorization.

61279765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12255958.

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

The square root of 61279765 is about 7828.1393063742. The cubic root of 61279765 is about 394.2506007065.

The spelling of 61279765 in words is "sixty-one million, two hundred seventy-nine thousand, seven hundred sixty-five".