64144140 has 48 divisors (see below), whose sum is σ = 180079200. Its totient is φ = 17059840.

The previous prime is 64144121. The next prime is 64144141. The reversal of 64144140 is 4144146.

It is a super-2 number, since 2×64144140² = 8228941392679200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64144140.

It is not an unprimeable number, because it can be changed into a prime (64144141) 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, 25750 + ... + 28130.

It is an arithmetic number, because the mean of its divisors is an integer number (3751650).

Almost surely, 2^64144140 is an apocalyptic number.

64144140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64144140 is an abundant number, since it is smaller than the sum of its proper divisors (115935060).

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

64144140 is a wasteful number, since it uses less digits than its factorization.

64144140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842 (or 2840 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 64144140 is about 8009.0036833554. The cubic root of 64144140 is about 400.3000665106.

Adding to 64144140 its reverse (4144146), we get a palindrome (68288286).

The spelling of 64144140 in words is "sixty-four million, one hundred forty-four thousand, one hundred forty".