61864865 has 4 divisors (see below), whose sum is σ = 74237844. Its totient is φ = 49491888.

The previous prime is 61864861. The next prime is 61864867. The reversal of 61864865 is 56846816.

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 18515809 + 43349056 = 4303^2 + 6584^2 .

It is a cyclic number.

It is not a de Polignac number, because 61864865 - 2² = 61864861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61864861) 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, 6186482 + ... + 6186491.

It is an arithmetic number, because the mean of its divisors is an integer number (18559461).

Almost surely, 2^61864865 is an apocalyptic number.

It is an amenable number.

61864865 is a deficient number, since it is larger than the sum of its proper divisors (12372979).

61864865 is a wasteful number, since it uses less digits than its factorization.

61864865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12372978.

The product of its digits is 276480, while the sum is 44.

The square root of 61864865 is about 7865.4221120039. The cubic root of 61864865 is about 395.5013982049.

The spelling of 61864865 in words is "sixty-one million, eight hundred sixty-four thousand, eight hundred sixty-five".