61642865 has 8 divisors (see below), whose sum is σ = 75691968. Its totient is φ = 48167280.

The previous prime is 61642853. The next prime is 61642891. The reversal of 61642865 is 56824616.

61642865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61642865 - 2¹² = 61638769 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 143141 + ... + 143570.

It is an arithmetic number, because the mean of its divisors is an integer number (9461496).

Almost surely, 2^61642865 is an apocalyptic number.

It is an amenable number.

61642865 is a deficient number, since it is larger than the sum of its proper divisors (14049103).

61642865 is a wasteful number, since it uses less digits than its factorization.

61642865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286759.

The product of its digits is 69120, while the sum is 38.

The square root of 61642865 is about 7851.2970266065. The cubic root of 61642865 is about 395.0277500133.

The spelling of 61642865 in words is "sixty-one million, six hundred forty-two thousand, eight hundred sixty-five".