67520681 has 4 divisors (see below), whose sum is σ = 67714500. Its totient is φ = 67326864.

The previous prime is 67520653. The next prime is 67520741. The reversal of 67520681 is 18602576.

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 58003456 + 9517225 = 7616^2 + 3085^2 .

It is a cyclic number.

It is not a de Polignac number, because 67520681 - 2¹⁰ = 67519657 is a prime.

It is a super-2 number, since 2×67520681² = 9118084725407522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67520611) 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, 96386 + ... + 97083.

It is an arithmetic number, because the mean of its divisors is an integer number (16928625).

Almost surely, 2^67520681 is an apocalyptic number.

It is an amenable number.

67520681 is a deficient number, since it is larger than the sum of its proper divisors (193819).

67520681 is a wasteful number, since it uses less digits than its factorization.

67520681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193818.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 67520681 is about 8217.0968717668. The cubic root of 67520681 is about 407.2042211104.

The spelling of 67520681 in words is "sixty-seven million, five hundred twenty thousand, six hundred eighty-one".