7278161 has 8 divisors (see below), whose sum is σ = 8019648. Its totient is φ = 6550000.

The previous prime is 7278157. The next prime is 7278199. The reversal of 7278161 is 1618727.

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

It is a cyclic number.

It is not a de Polignac number, because 7278161 - 2² = 7278157 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7278151) 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, 2165 + ... + 4386.

It is an arithmetic number, because the mean of its divisors is an integer number (1002456).

Almost surely, 2^7278161 is an apocalyptic number.

It is an amenable number.

7278161 is a deficient number, since it is larger than the sum of its proper divisors (741487).

7278161 is a wasteful number, since it uses less digits than its factorization.

7278161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6663.

The product of its digits is 4704, while the sum is 32.

The square root of 7278161 is about 2697.8067017487. The cubic root of 7278161 is about 193.7941008179.

It can be divided in two parts, 727 and 8161, that added together give a palindrome (8888).

The spelling of 7278161 in words is "seven million, two hundred seventy-eight thousand, one hundred sixty-one".