67320513 has 24 divisors (see below), whose sum is σ = 108337320. Its totient is φ = 39997440.

The previous prime is 67320511. The next prime is 67320529. The reversal of 67320513 is 31502376.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1272384 + 66048129 = 1128^2 + 8127^2 .

It is not a de Polignac number, because 67320513 - 2¹ = 67320511 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67320511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6528 + ... + 13313.

It is an arithmetic number, because the mean of its divisors is an integer number (4514055).

Almost surely, 2^67320513 is an apocalyptic number.

It is an amenable number.

67320513 is a deficient number, since it is larger than the sum of its proper divisors (41016807).

67320513 is a wasteful number, since it uses less digits than its factorization.

67320513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19889 (or 19886 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 27.

The square root of 67320513 is about 8204.9078605430. The cubic root of 67320513 is about 406.8014312680.

Adding to 67320513 its reverse (31502376), we get a palindrome (98822889).

The spelling of 67320513 in words is "sixty-seven million, three hundred twenty thousand, five hundred thirteen".