64669869 has 24 divisors (see below), whose sum is σ = 102278592. Its totient is φ = 39049920.

The previous prime is 64669867. The next prime is 64669873. The reversal of 64669869 is 96896646.

It is a happy number.

It is not a de Polignac number, because 64669869 - 2¹ = 64669867 is a prime.

It is a super-2 number, since 2×64669869² = 8364383912954322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64669867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29944 + ... + 32030.

It is an arithmetic number, because the mean of its divisors is an integer number (4261608).

Almost surely, 2^64669869 is an apocalyptic number.

It is an amenable number.

64669869 is a deficient number, since it is larger than the sum of its proper divisors (37608723).

64669869 is a wasteful number, since it uses less digits than its factorization.

64669869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417 (or 2414 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The square root of 64669869 is about 8041.7578302259. The cubic root of 64669869 is about 401.3907195607.

The spelling of 64669869 in words is "sixty-four million, six hundred sixty-nine thousand, eight hundred sixty-nine".