64143605 has 4 divisors (see below), whose sum is σ = 76972332. Its totient is φ = 51314880.

The previous prime is 64143593. The next prime is 64143613. The reversal of 64143605 is 50634146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50634146 = 2 ⋅25317073.

It can be written as a sum of positive squares in 2 ways, for example, as 49688401 + 14455204 = 7049^2 + 3802^2 .

It is not a de Polignac number, because 64143605 - 2⁸ = 64143349 is a prime.

It is a super-2 number, since 2×64143605² = 8228804124792050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6414356 + ... + 6414365.

It is an arithmetic number, because the mean of its divisors is an integer number (19243083).

Almost surely, 2^64143605 is an apocalyptic number.

It is an amenable number.

64143605 is a deficient number, since it is larger than the sum of its proper divisors (12828727).

64143605 is a wasteful number, since it uses less digits than its factorization.

64143605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12828726.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 64143605 is about 8008.9702833760. The cubic root of 64143605 is about 400.2989535945.

The spelling of 64143605 in words is "sixty-four million, one hundred forty-three thousand, six hundred five".