64861563 has 8 divisors (see below), whose sum is σ = 93134608. Its totient is φ = 39914784.

The previous prime is 64861543. The next prime is 64861583. The reversal of 64861563 is 36516846.

It is an interprime number because it is at equal distance from previous prime (64861543) and next prime (64861583).

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

It is not a de Polignac number, because 64861563 - 2¹⁰ = 64860539 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1663117 = 64861563 / (6 + 4 + 8 + 6 + 1 + 5 + 6 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64861543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 831520 + ... + 831597.

It is an arithmetic number, because the mean of its divisors is an integer number (11641826).

Almost surely, 2^64861563 is an apocalyptic number.

64861563 is a deficient number, since it is larger than the sum of its proper divisors (28273045).

64861563 is a wasteful number, since it uses less digits than its factorization.

64861563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663133.

The product of its digits is 103680, while the sum is 39.

The square root of 64861563 is about 8053.6676737993. The cubic root of 64861563 is about 401.7869282480.

The spelling of 64861563 in words is "sixty-four million, eight hundred sixty-one thousand, five hundred sixty-three".