67305981 has 16 divisors (see below), whose sum is σ = 93855744. Its totient is φ = 42822384.

The previous prime is 67305967. The next prime is 67306003. The reversal of 67305981 is 18950376.

It is not a de Polignac number, because 67305981 - 2⁵ = 67305949 is a prime.

It is a super-2 number, since 2×67305981² = 9060190156744722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67305181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41080 + ... + 42686.

It is an arithmetic number, because the mean of its divisors is an integer number (5865984).

Almost surely, 2^67305981 is an apocalyptic number.

It is an amenable number.

67305981 is a deficient number, since it is larger than the sum of its proper divisors (26549763).

67305981 is a wasteful number, since it uses less digits than its factorization.

67305981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 67305981 is about 8204.0222452161. The cubic root of 67305981 is about 406.7721580517.

It can be divided in two parts, 67305 and 981, that added together give a palindrome (68286).

The spelling of 67305981 in words is "sixty-seven million, three hundred five thousand, nine hundred eighty-one".