67536981 has 6 divisors (see below), whose sum is σ = 97553430. Its totient is φ = 45024648.

The previous prime is 67536977. The next prime is 67537007. The reversal of 67536981 is 18963576.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 40068900 + 27468081 = 6330^2 + 5241^2 .

It is not a de Polignac number, because 67536981 - 2² = 67536977 is a prime.

It is a super-2 number, since 2×67536981² = 9122487605188722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67536481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3752046 + ... + 3752063.

It is an arithmetic number, because the mean of its divisors is an integer number (16258905).

Almost surely, 2^67536981 is an apocalyptic number.

It is an amenable number.

67536981 is a deficient number, since it is larger than the sum of its proper divisors (30016449).

67536981 is a wasteful number, since it uses less digits than its factorization.

67536981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7504115 (or 7504112 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 67536981 is about 8218.0886463946. The cubic root of 67536981 is about 407.2369858607.

The spelling of 67536981 in words is "sixty-seven million, five hundred thirty-six thousand, nine hundred eighty-one".