74815457 has 2 divisors, whose sum is σ = 74815458. Its totient is φ = 74815456.

The previous prime is 74815439. The next prime is 74815459. The reversal of 74815457 is 75451847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74718736 + 96721 = 8644^2 + 311^2 .

It is an emirp because it is prime and its reverse (75451847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74815457 - 2⁶ = 74815393 is a prime.

It is a super-2 number, since 2×74815457² = 11194705212237698, which contains 22 as substring.

Together with 74815459, 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 (74815459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37407728 + 37407729.

It is an arithmetic number, because the mean of its divisors is an integer number (37407729).

Almost surely, 2^74815457 is an apocalyptic number.

It is an amenable number.

74815457 is a deficient number, since it is larger than the sum of its proper divisors (1).

74815457 is an equidigital number, since it uses as much as digits as its factorization.

74815457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156800, while the sum is 41.

The square root of 74815457 is about 8649.5928805927. The cubic root of 74815457 is about 421.3701605807.

The spelling of 74815457 in words is "seventy-four million, eight hundred fifteen thousand, four hundred fifty-seven".