67607681 has 4 divisors (see below), whose sum is σ = 71166000. Its totient is φ = 64049364.

The previous prime is 67607669. The next prime is 67607689. The reversal of 67607681 is 18670676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67607681 - 2¹⁴ = 67591297 is a prime.

It is a super-2 number, since 2×67607681² = 9141597060395522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67607689) 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, 1779131 + ... + 1779168.

It is an arithmetic number, because the mean of its divisors is an integer number (17791500).

Almost surely, 2^67607681 is an apocalyptic number.

It is an amenable number.

67607681 is a deficient number, since it is larger than the sum of its proper divisors (3558319).

67607681 is a wasteful number, since it uses less digits than its factorization.

67607681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558318.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 67607681 is about 8222.3890080682. The cubic root of 67607681 is about 407.3790394617.

It can be divided in two parts, 6760 and 7681, that added together give a palindrome (14441).

The spelling of 67607681 in words is "sixty-seven million, six hundred seven thousand, six hundred eighty-one".