64511320 has 32 divisors (see below), whose sum is σ = 151463520. Its totient is φ = 24682240.

The previous prime is 64511303. The next prime is 64511329. The reversal of 64511320 is 2311546.

It is a junction number, because it is equal to n+sod(n) for n = 64511291 and 64511300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64511329) 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, 34141 + ... + 35980.

It is an arithmetic number, because the mean of its divisors is an integer number (4733235).

Almost surely, 2^64511320 is an apocalyptic number.

It is an amenable number.

64511320 is an abundant number, since it is smaller than the sum of its proper divisors (86952200).

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

64511320 is a wasteful number, since it uses less digits than its factorization.

64511320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70155 (or 70151 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 64511320 is about 8031.8939236023. The cubic root of 64511320 is about 401.0624256311.

Adding to 64511320 its reverse (2311546), we get a palindrome (66822866).

The spelling of 64511320 in words is "sixty-four million, five hundred eleven thousand, three hundred twenty".