7978281 has 8 divisors (see below), whose sum is σ = 10663200. Its totient is φ = 5306112.

The previous prime is 7978279. The next prime is 7978301. The reversal of 7978281 is 1828797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7978281 - 2¹ = 7978279 is a prime.

It is a super-2 number, since 2×7978281² = 127305935429922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7978211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1615 + ... + 4308.

It is an arithmetic number, because the mean of its divisors is an integer number (1332900).

Almost surely, 2^7978281 is an apocalyptic number.

It is an amenable number.

7978281 is a deficient number, since it is larger than the sum of its proper divisors (2684919).

7978281 is a wasteful number, since it uses less digits than its factorization.

7978281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6375.

The product of its digits is 56448, while the sum is 42.

The square root of 7978281 is about 2824.5851022761. The cubic root of 7978281 is about 199.8188442959.

The spelling of 7978281 in words is "seven million, nine hundred seventy-eight thousand, two hundred eighty-one".