74978281 has 9 divisors (see below), whose sum is σ = 87290199. Its totient is φ = 64215144.

The previous prime is 74978263. The next prime is 74978287. The reversal of 74978281 is 18287947.

The square root of 74978281 is 8659.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 18352656 = 7525^2 + 4284^2 .

It is not a de Polignac number, because 74978281 - 2⁵ = 74978249 is a prime.

It is a super-2 number, since 2×74978281² = 11243485243429922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74978287) 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 8 ways as a sum of consecutive naturals, for example, 59995 + ... + 61231.

It is an arithmetic number, because the mean of its divisors is an integer number (9698911).

Almost surely, 2^74978281 is an apocalyptic number.

74978281 is the 8659-th square number.

74978281 is the 4330-th centered octagonal number.

It is an amenable number.

74978281 is a deficient number, since it is larger than the sum of its proper divisors (12311918).

74978281 is an frugal number, since it uses more digits than its factorization.

74978281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488 (or 1244 counting only the distinct ones).

The product of its digits is 225792, while the sum is 46.

The cubic root of 74978281 is about 421.6756209117.

The spelling of 74978281 in words is "seventy-four million, nine hundred seventy-eight thousand, two hundred eighty-one".