64680861 has 32 divisors (see below), whose sum is σ = 100816128. Its totient is φ = 36126720.

The previous prime is 64680841. The next prime is 64680871. The reversal of 64680861 is 16808646.

It is not a de Polignac number, because 64680861 - 2⁶ = 64680797 is a prime.

It is a super-2 number, since 2×64680861² = 8367227559402642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64680841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230041 + ... + 230321.

It is an arithmetic number, because the mean of its divisors is an integer number (3150504).

Almost surely, 2^64680861 is an apocalyptic number.

It is an amenable number.

64680861 is a deficient number, since it is larger than the sum of its proper divisors (36135267).

64680861 is a wasteful number, since it uses less digits than its factorization.

64680861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 64680861 is about 8042.4412338543. The cubic root of 64680861 is about 401.4134598616.

The spelling of 64680861 in words is "sixty-four million, six hundred eighty thousand, eight hundred sixty-one".