64781142 has 16 divisors (see below), whose sum is σ = 131019120. Its totient is φ = 21350912.

The previous prime is 64781131. The next prime is 64781147. The reversal of 64781142 is 24118746.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64781147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60123 + ... + 61190.

It is an arithmetic number, because the mean of its divisors is an integer number (8188695).

Almost surely, 2^64781142 is an apocalyptic number.

64781142 is an abundant number, since it is smaller than the sum of its proper divisors (66237978).

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

64781142 is a wasteful number, since it uses less digits than its factorization.

64781142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121407.

The product of its digits is 10752, while the sum is 33.

The square root of 64781142 is about 8048.6733068252. The cubic root of 64781142 is about 401.6208027919.

Adding to 64781142 its reverse (24118746), we get a palindrome (88899888).

The spelling of 64781142 in words is "sixty-four million, seven hundred eighty-one thousand, one hundred forty-two".