67428281 has 2 divisors, whose sum is σ = 67428282. Its totient is φ = 67428280.

The previous prime is 67428271. The next prime is 67428367. The reversal of 67428281 is 18282476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61763881 + 5664400 = 7859^2 + 2380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67428281 is a prime.

It is a super-3 number, since 3×67428281³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (67428211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33714140 + 33714141.

It is an arithmetic number, because the mean of its divisors is an integer number (33714141).

Almost surely, 2^67428281 is an apocalyptic number.

It is an amenable number.

67428281 is a deficient number, since it is larger than the sum of its proper divisors (1).

67428281 is an equidigital number, since it uses as much as digits as its factorization.

67428281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 38.

The square root of 67428281 is about 8211.4725232445. The cubic root of 67428281 is about 407.0183874481.

The spelling of 67428281 in words is "sixty-seven million, four hundred twenty-eight thousand, two hundred eighty-one".