74728019 has 2 divisors, whose sum is σ = 74728020. Its totient is φ = 74728018.

The previous prime is 74728001. The next prime is 74728021. The reversal of 74728019 is 91082747.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74728019 is a prime.

It is a super-2 number, since 2×74728019² = 11168553647328722, which contains 22 as substring.

Together with 74728021, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74728079) 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, 37364009 + 37364010.

It is an arithmetic number, because the mean of its divisors is an integer number (37364010).

Almost surely, 2^74728019 is an apocalyptic number.

74728019 is a deficient number, since it is larger than the sum of its proper divisors (1).

74728019 is an equidigital number, since it uses as much as digits as its factorization.

74728019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 74728019 is about 8644.5369453777. The cubic root of 74728019 is about 421.2059426138.

The spelling of 74728019 in words is "seventy-four million, seven hundred twenty-eight thousand, nineteen".