64581942 has 8 divisors (see below), whose sum is σ = 129163896. Its totient is φ = 21527312.

The previous prime is 64581917. The next prime is 64581943. The reversal of 64581942 is 24918546.

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

64581942 is an admirable number.

It is a super-3 number, since 3×64581942³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64581942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64581943) 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, 5381823 + ... + 5381834.

It is an arithmetic number, because the mean of its divisors is an integer number (16145487).

Almost surely, 2^64581942 is an apocalyptic number.

64581942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64581942 is a wasteful number, since it uses less digits than its factorization.

64581942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10763662.

The product of its digits is 69120, while the sum is 39.

The square root of 64581942 is about 8036.2890689671. The cubic root of 64581942 is about 401.2087229596.

The spelling of 64581942 in words is "sixty-four million, five hundred eighty-one thousand, nine hundred forty-two".