64885861 has 4 divisors (see below), whose sum is σ = 65010924. Its totient is φ = 64760800.

The previous prime is 64885837. The next prime is 64885879. The reversal of 64885861 is 16858846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16858846 = 2 ⋅8429423.

It can be written as a sum of positive squares in 2 ways, for example, as 5688225 + 59197636 = 2385^2 + 7694^2 .

It is a cyclic number.

It is not a de Polignac number, because 64885861 - 2¹¹ = 64883813 is a prime.

It is a super-2 number, since 2×64885861² = 8420349915422642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64885811) 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, 61750 + ... + 62791.

It is an arithmetic number, because the mean of its divisors is an integer number (16252731).

Almost surely, 2^64885861 is an apocalyptic number.

It is an amenable number.

64885861 is a deficient number, since it is larger than the sum of its proper divisors (125063).

64885861 is a wasteful number, since it uses less digits than its factorization.

64885861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125062.

The product of its digits is 368640, while the sum is 46.

The square root of 64885861 is about 8055.1760378033. The cubic root of 64885861 is about 401.8370935515.

The spelling of 64885861 in words is "sixty-four million, eight hundred eighty-five thousand, eight hundred sixty-one".