64869128 has 8 divisors (see below), whose sum is σ = 121629630. Its totient is φ = 32434560.

The previous prime is 64869107. The next prime is 64869137. The reversal of 64869128 is 82196846.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 64673764 + 195364 = 8042^2 + 442^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4054313 + ... + 4054328.

Almost surely, 2^64869128 is an apocalyptic number.

It is an amenable number.

64869128 is a deficient number, since it is larger than the sum of its proper divisors (56760502).

64869128 is a wasteful number, since it uses less digits than its factorization.

64869128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8108647 (or 8108643 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 64869128 is about 8054.1373218986. The cubic root of 64869128 is about 401.8025481818.

The spelling of 64869128 in words is "sixty-four million, eight hundred sixty-nine thousand, one hundred twenty-eight".