64517020 has 24 divisors (see below), whose sum is σ = 135672768. Its totient is φ = 25771200.

The previous prime is 64516973. The next prime is 64517021. The reversal of 64517020 is 2071546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64517021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16450 + ... + 19990.

It is an arithmetic number, because the mean of its divisors is an integer number (5653032).

Almost surely, 2^64517020 is an apocalyptic number.

It is an amenable number.

64517020 is an abundant number, since it is smaller than the sum of its proper divisors (71155748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64517020 is a wasteful number, since it uses less digits than its factorization.

64517020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4461 (or 4459 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 64517020 is about 8032.2487511282. The cubic root of 64517020 is about 401.0742374521.

Adding to 64517020 its reverse (2071546), we get a palindrome (66588566).

The spelling of 64517020 in words is "sixty-four million, five hundred seventeen thousand, twenty".