61860709 has 4 divisors (see below), whose sum is σ = 61925004. Its totient is φ = 61796416.

The previous prime is 61860691. The next prime is 61860719. The reversal of 61860709 is 90706816.

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 30835809 + 31024900 = 5553^2 + 5570^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61860709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61860719) 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, 30682 + ... + 32635.

It is an arithmetic number, because the mean of its divisors is an integer number (15481251).

Almost surely, 2^61860709 is an apocalyptic number.

It is an amenable number.

61860709 is a deficient number, since it is larger than the sum of its proper divisors (64295).

61860709 is an equidigital number, since it uses as much as digits as its factorization.

61860709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64294.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 61860709 is about 7865.1579132272. The cubic root of 61860709 is about 395.4925415859.

The spelling of 61860709 in words is "sixty-one million, eight hundred sixty thousand, seven hundred nine".