64140789 has 16 divisors (see below), whose sum is σ = 90534080. Its totient is φ = 40279680.

The previous prime is 64140763. The next prime is 64140809. The reversal of 64140789 is 98704146.

It is a happy number.

It is not a de Polignac number, because 64140789 - 2¹¹ = 64138741 is a prime.

It is a super-2 number, since 2×64140789² = 8228081627085042, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64140389) 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 15 ways as a sum of consecutive naturals, for example, 7209 + ... + 13425.

It is an arithmetic number, because the mean of its divisors is an integer number (5658380).

Almost surely, 2^64140789 is an apocalyptic number.

It is an amenable number.

64140789 is a deficient number, since it is larger than the sum of its proper divisors (26393291).

64140789 is a wasteful number, since it uses less digits than its factorization.

64140789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6420.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 64140789 is about 8008.7944785717. The cubic root of 64140789 is about 400.2930956016.

The spelling of 64140789 in words is "sixty-four million, one hundred forty thousand, seven hundred eighty-nine".