61860865 has 16 divisors (see below), whose sum is σ = 85245120. Its totient is φ = 42621120.

The previous prime is 61860863. The next prime is 61860901. The reversal of 61860865 is 56806816.

It is a happy number.

It is not a de Polignac number, because 61860865 - 2¹ = 61860863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61860863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28554 + ... + 30643.

It is an arithmetic number, because the mean of its divisors is an integer number (5327820).

Almost surely, 2^61860865 is an apocalyptic number.

It is an amenable number.

61860865 is a deficient number, since it is larger than the sum of its proper divisors (23384255).

61860865 is a wasteful number, since it uses less digits than its factorization.

61860865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59232.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 61860865 is about 7865.1678303772. The cubic root of 61860865 is about 395.4928740359.

The spelling of 61860865 in words is "sixty-one million, eight hundred sixty thousand, eight hundred sixty-five".