67736621 has 4 divisors (see below), whose sum is σ = 67988700. Its totient is φ = 67484544.

The previous prime is 67736579. The next prime is 67736623. The reversal of 67736621 is 12663776.

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 4708900 + 63027721 = 2170^2 + 7939^2 .

It is a cyclic number.

It is not a de Polignac number, because 67736621 - 2¹⁰ = 67735597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67736623) 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, 125636 + ... + 126173.

It is an arithmetic number, because the mean of its divisors is an integer number (16997175).

Almost surely, 2^67736621 is an apocalyptic number.

It is an amenable number.

67736621 is a deficient number, since it is larger than the sum of its proper divisors (252079).

67736621 is a wasteful number, since it uses less digits than its factorization.

67736621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252078.

The product of its digits is 63504, while the sum is 38.

The square root of 67736621 is about 8230.2260600788. The cubic root of 67736621 is about 407.6378566789.

The spelling of 67736621 in words is "sixty-seven million, seven hundred thirty-six thousand, six hundred twenty-one".