64520829 has 6 divisors (see below), whose sum is σ = 93196766. Its totient is φ = 43013880.

The previous prime is 64520803. The next prime is 64520857. The reversal of 64520829 is 92802546.

It is a happy number.

64520829 is a `hidden beast` number, since 645 + 2 + 0 + 8 + 2 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 36324729 + 28196100 = 6027^2 + 5310^2 .

It is not a de Polignac number, because 64520829 - 2⁹ = 64520317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64520793 and 64520802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64520629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3584482 + ... + 3584499.

Almost surely, 2^64520829 is an apocalyptic number.

It is an amenable number.

64520829 is a deficient number, since it is larger than the sum of its proper divisors (28675937).

64520829 is a wasteful number, since it uses less digits than its factorization.

64520829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7168987 (or 7168984 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 64520829 is about 8032.4858543293. The cubic root of 64520829 is about 401.0821302619.

The spelling of 64520829 in words is "sixty-four million, five hundred twenty thousand, eight hundred twenty-nine".