66428767 has 2 divisors, whose sum is σ = 66428768. Its totient is φ = 66428766.

The previous prime is 66428711. The next prime is 66428771. The reversal of 66428767 is 76782466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66428767 - 2¹¹ = 66426719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66428777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33214383 + 33214384.

It is an arithmetic number, because the mean of its divisors is an integer number (33214384).

Almost surely, 2^66428767 is an apocalyptic number.

66428767 is a deficient number, since it is larger than the sum of its proper divisors (1).

66428767 is an equidigital number, since it uses as much as digits as its factorization.

66428767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 46.

The square root of 66428767 is about 8150.3844694591. The cubic root of 66428767 is about 404.9972402393.

The spelling of 66428767 in words is "sixty-six million, four hundred twenty-eight thousand, seven hundred sixty-seven".