74647157 has 4 divisors (see below), whose sum is σ = 80389260. Its totient is φ = 68905056.

The previous prime is 74647151. The next prime is 74647169. The reversal of 74647157 is 75174647.

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 17023876 + 57623281 = 4126^2 + 7591^2 .

It is a cyclic number.

It is not a de Polignac number, because 74647157 - 2¹² = 74643061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74647151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2871032 + ... + 2871057.

It is an arithmetic number, because the mean of its divisors is an integer number (20097315).

Almost surely, 2^74647157 is an apocalyptic number.

It is an amenable number.

74647157 is a deficient number, since it is larger than the sum of its proper divisors (5742103).

74647157 is a wasteful number, since it uses less digits than its factorization.

74647157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5742102.

The product of its digits is 164640, while the sum is 41.

The square root of 74647157 is about 8639.8586215285. The cubic root of 74647157 is about 421.0539610328.

The spelling of 74647157 in words is "seventy-four million, six hundred forty-seven thousand, one hundred fifty-seven".