64239769 has 4 divisors (see below), whose sum is σ = 70079760. Its totient is φ = 58399780.

The previous prime is 64239751. The next prime is 64239793. The reversal of 64239769 is 96793246.

64239769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64239769 - 2⁷ = 64239641 is a prime.

It is a super-2 number, since 2×64239769² = 8253495842346722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64239569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2919979 + ... + 2920000.

It is an arithmetic number, because the mean of its divisors is an integer number (17519940).

Almost surely, 2^64239769 is an apocalyptic number.

It is an amenable number.

64239769 is a deficient number, since it is larger than the sum of its proper divisors (5839991).

64239769 is a wasteful number, since it uses less digits than its factorization.

64239769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5839990.

The product of its digits is 489888, while the sum is 46.

The square root of 64239769 is about 8014.9715532870. The cubic root of 64239769 is about 400.4988962476.

The spelling of 64239769 in words is "sixty-four million, two hundred thirty-nine thousand, seven hundred sixty-nine".