67220639 has 2 divisors, whose sum is σ = 67220640. Its totient is φ = 67220638.

The previous prime is 67220633. The next prime is 67220641. The reversal of 67220639 is 93602276.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67220639 - 2⁴ = 67220623 is a prime.

It is a super-2 number, since 2×67220639² = 9037228615136642, which contains 22 as substring.

Together with 67220641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 67220599 and 67220608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67220633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33610319 + 33610320.

It is an arithmetic number, because the mean of its divisors is an integer number (33610320).

Almost surely, 2^67220639 is an apocalyptic number.

67220639 is a deficient number, since it is larger than the sum of its proper divisors (1).

67220639 is an equidigital number, since it uses as much as digits as its factorization.

67220639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 67220639 is about 8198.8193662258. The cubic root of 67220639 is about 406.6001602997.

The spelling of 67220639 in words is "sixty-seven million, two hundred twenty thousand, six hundred thirty-nine".