74897279 has 4 divisors (see below), whose sum is σ = 75584520. Its totient is φ = 74210040.

The previous prime is 74897237. The next prime is 74897299. The reversal of 74897279 is 97279847.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74897279 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74897279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74897299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343457 + ... + 343674.

It is an arithmetic number, because the mean of its divisors is an integer number (18896130).

Almost surely, 2^74897279 is an apocalyptic number.

74897279 is a deficient number, since it is larger than the sum of its proper divisors (687241).

74897279 is a wasteful number, since it uses less digits than its factorization.

74897279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687240.

The product of its digits is 1778112, while the sum is 53.

The square root of 74897279 is about 8654.3214060953. The cubic root of 74897279 is about 421.5237152496.

The spelling of 74897279 in words is "seventy-four million, eight hundred ninety-seven thousand, two hundred seventy-nine".