67772921 has 2 divisors, whose sum is σ = 67772922. Its totient is φ = 67772920.

The previous prime is 67772879. The next prime is 67772933. The reversal of 67772921 is 12927776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62647225 + 5125696 = 7915^2 + 2264^2 .

It is a cyclic number.

It is not a de Polignac number, because 67772921 - 2⁶ = 67772857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67772021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33886460 + 33886461.

It is an arithmetic number, because the mean of its divisors is an integer number (33886461).

Almost surely, 2^67772921 is an apocalyptic number.

It is an amenable number.

67772921 is a deficient number, since it is larger than the sum of its proper divisors (1).

67772921 is an equidigital number, since it uses as much as digits as its factorization.

67772921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 41.

The square root of 67772921 is about 8232.4310504249. The cubic root of 67772921 is about 407.7106612736.

The spelling of 67772921 in words is "sixty-seven million, seven hundred seventy-two thousand, nine hundred twenty-one".