64613320 has 16 divisors (see below), whose sum is σ = 145380060. Its totient is φ = 25845312.

The previous prime is 64613317. The next prime is 64613321. The reversal of 64613320 is 2331646.

It can be written as a sum of positive squares in 2 ways, for example, as 61811044 + 2802276 = 7862^2 + 1674^2 .

It is a super-2 number, since 2×64613320² = 8349762242844800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64613321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 807627 + ... + 807706.

Almost surely, 2^64613320 is an apocalyptic number.

It is an amenable number.

64613320 is an abundant number, since it is smaller than the sum of its proper divisors (80766740).

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

64613320 is a wasteful number, since it uses less digits than its factorization.

64613320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615344 (or 1615340 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 64613320 is about 8038.2411011365. The cubic root of 64613320 is about 401.2736899798.

Adding to 64613320 its reverse (2331646), we get a palindrome (66944966).

The spelling of 64613320 in words is "sixty-four million, six hundred thirteen thousand, three hundred twenty".