64860081 has 16 divisors (see below), whose sum is σ = 101599680. Its totient is φ = 36285120.

The previous prime is 64860071. The next prime is 64860109. The reversal of 64860081 is 18006846.

It is not a de Polignac number, because 64860081 - 2⁶ = 64860017 is a prime.

It is a super-2 number, since 2×64860081² = 8413660214653122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (64860071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75166 + ... + 76023.

It is an arithmetic number, because the mean of its divisors is an integer number (6349980).

Almost surely, 2^64860081 is an apocalyptic number.

It is an amenable number.

64860081 is a deficient number, since it is larger than the sum of its proper divisors (36739599).

64860081 is a wasteful number, since it uses less digits than its factorization.

64860081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151216.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 64860081 is about 8053.5756655041. The cubic root of 64860081 is about 401.7838681267.

The spelling of 64860081 in words is "sixty-four million, eight hundred sixty thousand, eighty-one".