64506320 has 20 divisors (see below), whose sum is σ = 149977380. Its totient is φ = 25802496.

The previous prime is 64506317. The next prime is 64506331. The reversal of 64506320 is 2360546.

It can be written as a sum of positive squares in 2 ways, for example, as 41886784 + 22619536 = 6472^2 + 4756^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×64506320² = 8322130639884800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64506320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 403085 + ... + 403244.

It is an arithmetic number, because the mean of its divisors is an integer number (7498869).

Almost surely, 2^64506320 is an apocalyptic number.

It is an amenable number.

64506320 is an abundant number, since it is smaller than the sum of its proper divisors (85471060).

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

64506320 is a wasteful number, since it uses less digits than its factorization.

64506320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806342 (or 806336 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 64506320 is about 8031.5826584802. The cubic root of 64506320 is about 401.0520638117.

Adding to 64506320 its reverse (2360546), we get a palindrome (66866866).

The spelling of 64506320 in words is "sixty-four million, five hundred six thousand, three hundred twenty".