61984865 has 4 divisors (see below), whose sum is σ = 74381844. Its totient is φ = 49587888.

The previous prime is 61984831. The next prime is 61984891. The reversal of 61984865 is 56848916.

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 16192576 + 45792289 = 4024^2 + 6767^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61984865 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6198482 + ... + 6198491.

It is an arithmetic number, because the mean of its divisors is an integer number (18595461).

Almost surely, 2^61984865 is an apocalyptic number.

It is an amenable number.

61984865 is a deficient number, since it is larger than the sum of its proper divisors (12396979).

61984865 is a wasteful number, since it uses less digits than its factorization.

61984865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12396978.

The product of its digits is 414720, while the sum is 47.

The square root of 61984865 is about 7873.0467418910. The cubic root of 61984865 is about 395.7569526000.

The spelling of 61984865 in words is "sixty-one million, nine hundred eighty-four thousand, eight hundred sixty-five".