74945257 has 4 divisors (see below), whose sum is σ = 76000896. Its totient is φ = 73889620.

The previous prime is 74945243. The next prime is 74945279. The reversal of 74945257 is 75254947.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74945257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74945287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527713 + ... + 527854.

It is an arithmetic number, because the mean of its divisors is an integer number (19000224).

Almost surely, 2^74945257 is an apocalyptic number.

It is an amenable number.

74945257 is a deficient number, since it is larger than the sum of its proper divisors (1055639).

74945257 is a wasteful number, since it uses less digits than its factorization.

74945257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055638.

The product of its digits is 352800, while the sum is 43.

The square root of 74945257 is about 8657.0928723215. The cubic root of 74945257 is about 421.6137031560.

The spelling of 74945257 in words is "seventy-four million, nine hundred forty-five thousand, two hundred fifty-seven".