73667821 has 2 divisors, whose sum is σ = 73667822. Its totient is φ = 73667820.

The previous prime is 73667819. The next prime is 73667831. The reversal of 73667821 is 12876637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58690921 + 14976900 = 7661^2 + 3870^2 .

It is a cyclic number.

It is not a de Polignac number, because 73667821 - 2¹ = 73667819 is a prime.

Together with 73667819, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73667831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36833910 + 36833911.

It is an arithmetic number, because the mean of its divisors is an integer number (36833911).

Almost surely, 2^73667821 is an apocalyptic number.

It is an amenable number.

73667821 is a deficient number, since it is larger than the sum of its proper divisors (1).

73667821 is an equidigital number, since it uses as much as digits as its factorization.

73667821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 40.

The square root of 73667821 is about 8582.9960386802. The cubic root of 73667821 is about 419.2045052161.

The spelling of 73667821 in words is "seventy-three million, six hundred sixty-seven thousand, eight hundred twenty-one".