67840457 has 2 divisors, whose sum is σ = 67840458. Its totient is φ = 67840456.

The previous prime is 67840453. The next prime is 67840511. The reversal of 67840457 is 75404876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64384576 + 3455881 = 8024^2 + 1859^2 .

It is a cyclic number.

It is not a de Polignac number, because 67840457 - 2² = 67840453 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67840453) 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, 33920228 + 33920229.

It is an arithmetic number, because the mean of its divisors is an integer number (33920229).

Almost surely, 2^67840457 is an apocalyptic number.

It is an amenable number.

67840457 is a deficient number, since it is larger than the sum of its proper divisors (1).

67840457 is an equidigital number, since it uses as much as digits as its factorization.

67840457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 67840457 is about 8236.5318550953. The cubic root of 67840457 is about 407.8460447747.

The spelling of 67840457 in words is "sixty-seven million, eight hundred forty thousand, four hundred fifty-seven".