67128013 has 4 divisors (see below), whose sum is σ = 67499068. Its totient is φ = 66756960.

The previous prime is 67128001. The next prime is 67128023. The reversal of 67128013 is 31082176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5866084 + 61261929 = 2422^2 + 7827^2 .

It is a cyclic number.

It is not a de Polignac number, because 67128013 - 2¹³ = 67119821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67128023) 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, 185256 + ... + 185617.

It is an arithmetic number, because the mean of its divisors is an integer number (16874767).

Almost surely, 2^67128013 is an apocalyptic number.

It is an amenable number.

67128013 is a deficient number, since it is larger than the sum of its proper divisors (371055).

67128013 is a wasteful number, since it uses less digits than its factorization.

67128013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371054.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 67128013 is about 8193.1686788446. The cubic root of 67128013 is about 406.4133175939.

The spelling of 67128013 in words is "sixty-seven million, one hundred twenty-eight thousand, thirteen".