64140020 has 36 divisors (see below), whose sum is σ = 156687300. Its totient is φ = 21990528.

The previous prime is 64140019. The next prime is 64140059. The reversal of 64140020 is 2004146.

It can be written as a sum of positive squares in 2 ways, for example, as 32307856 + 31832164 = 5684^2 + 5642^2 .

It is a super-2 number, since 2×64140020² = 8227884331200800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31745 + ... + 33704.

It is an arithmetic number, because the mean of its divisors is an integer number (4352425).

Almost surely, 2^64140020 is an apocalyptic number.

It is an amenable number.

64140020 is an abundant number, since it is smaller than the sum of its proper divisors (92547280).

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

64140020 is a wasteful number, since it uses less digits than its factorization.

64140020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65472 (or 65463 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 64140020 is about 8008.7464687053. The cubic root of 64140020 is about 400.2914958571.

Adding to 64140020 its reverse (2004146), we get a palindrome (66144166).

The spelling of 64140020 in words is "sixty-four million, one hundred forty thousand, twenty".