74642857 has 4 divisors (see below), whose sum is σ = 74734596. Its totient is φ = 74551120.

The previous prime is 74642851. The next prime is 74642881. The reversal of 74642857 is 75824647.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36252441 + 38390416 = 6021^2 + 6196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74642857 is a prime.

It is a super-2 number, since 2×74642857² = 11143112202244898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74642851) 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, 44638 + ... + 46279.

It is an arithmetic number, because the mean of its divisors is an integer number (18683649).

Almost surely, 2^74642857 is an apocalyptic number.

It is an amenable number.

74642857 is a deficient number, since it is larger than the sum of its proper divisors (91739).

74642857 is an equidigital number, since it uses as much as digits as its factorization.

74642857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91738.

The product of its digits is 376320, while the sum is 43.

The square root of 74642857 is about 8639.6097712802. The cubic root of 74642857 is about 421.0458760328.

The spelling of 74642857 in words is "seventy-four million, six hundred forty-two thousand, eight hundred fifty-seven".