67647121 has 8 divisors (see below), whose sum is σ = 68739944. Its totient is φ = 66562560.

The previous prime is 67647103. The next prime is 67647149. The reversal of 67647121 is 12174676.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8910225 + 58736896 = 2985^2 + 7664^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67647121 - 2¹⁵ = 67614353 is a prime.

It is a super-2 number, since 2×67647121² = 9152265959177282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67647101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15631 + ... + 19483.

It is an arithmetic number, because the mean of its divisors is an integer number (8592493).

Almost surely, 2^67647121 is an apocalyptic number.

It is an amenable number.

67647121 is a deficient number, since it is larger than the sum of its proper divisors (1092823).

67647121 is a wasteful number, since it uses less digits than its factorization.

67647121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131.

The product of its digits is 14112, while the sum is 34.

The square root of 67647121 is about 8224.7869881232. The cubic root of 67647121 is about 407.4582410444.

The spelling of 67647121 in words is "sixty-seven million, six hundred forty-seven thousand, one hundred twenty-one".