64763889 has 4 divisors (see below), whose sum is σ = 86351856. Its totient is φ = 43175924.

The previous prime is 64763869. The next prime is 64763903. The reversal of 64763889 is 98836746.

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 64763889 - 2¹¹ = 64761841 is a prime.

It is a super-2 number, since 2×64763889² = 8388722636808642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64763849) 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 3 ways as a sum of consecutive naturals, for example, 10793979 + ... + 10793984.

It is an arithmetic number, because the mean of its divisors is an integer number (21587964).

Almost surely, 2^64763889 is an apocalyptic number.

It is an amenable number.

64763889 is a deficient number, since it is larger than the sum of its proper divisors (21587967).

64763889 is a wasteful number, since it uses less digits than its factorization.

64763889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21587966.

The product of its digits is 1741824, while the sum is 51.

The square root of 64763889 is about 8047.6014439086. The cubic root of 64763889 is about 401.5851454039.

The spelling of 64763889 in words is "sixty-four million, seven hundred sixty-three thousand, eight hundred eighty-nine".