67288621 has 2 divisors, whose sum is σ = 67288622. Its totient is φ = 67288620.

The previous prime is 67288597. The next prime is 67288691. The reversal of 67288621 is 12688276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67076100 + 212521 = 8190^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 67288621 - 2⁵ = 67288589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67288691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33644310 + 33644311.

It is an arithmetic number, because the mean of its divisors is an integer number (33644311).

Almost surely, 2^67288621 is an apocalyptic number.

It is an amenable number.

67288621 is a deficient number, since it is larger than the sum of its proper divisors (1).

67288621 is an equidigital number, since it uses as much as digits as its factorization.

67288621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 67288621 is about 8202.9641593756. The cubic root of 67288621 is about 406.7371825970.

The spelling of 67288621 in words is "sixty-seven million, two hundred eighty-eight thousand, six hundred twenty-one".