7282778 has 4 divisors (see below), whose sum is σ = 10924170. Its totient is φ = 3641388.

The previous prime is 7282777. The next prime is 7282787. The reversal of 7282778 is 8772827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8772827 = 7 ⋅1253261.

It can be written as a sum of positive squares in only one way, i.e., 5257849 + 2024929 = 2293^2 + 1423^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7282771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820693 + ... + 1820696.

Almost surely, 2^7282778 is an apocalyptic number.

7282778 is a deficient number, since it is larger than the sum of its proper divisors (3641392).

7282778 is a wasteful number, since it uses less digits than its factorization.

7282778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3641391.

The product of its digits is 87808, while the sum is 41.

The square root of 7282778 is about 2698.6622611954. The cubic root of 7282778 is about 193.8350707933.

The spelling of 7282778 in words is "seven million, two hundred eighty-two thousand, seven hundred seventy-eight".