74243257 has 8 divisors (see below), whose sum is σ = 81057600. Its totient is φ = 67439760.

The previous prime is 74243243. The next prime is 74243261. The reversal of 74243257 is 75234247.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74243257 is a prime.

It is a super-2 number, since 2×74243257² = 11024122419936098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74243237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19708 + ... + 23170.

It is an arithmetic number, because the mean of its divisors is an integer number (10132200).

Almost surely, 2^74243257 is an apocalyptic number.

It is an amenable number.

74243257 is a deficient number, since it is larger than the sum of its proper divisors (6814343).

74243257 is a wasteful number, since it uses less digits than its factorization.

74243257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5423.

The product of its digits is 47040, while the sum is 34.

The square root of 74243257 is about 8616.4526923787. The cubic root of 74243257 is about 420.2931758790.

The spelling of 74243257 in words is "seventy-four million, two hundred forty-three thousand, two hundred fifty-seven".