7425778 has 4 divisors (see below), whose sum is σ = 11138670. Its totient is φ = 3712888.

The previous prime is 7425773. The next prime is 7425809. The reversal of 7425778 is 8775247.

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

It can be written as a sum of positive squares in only one way, i.e., 5094049 + 2331729 = 2257^2 + 1527^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 7425778.

It is not an unprimeable number, because it can be changed into a prime (7425773) 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 as a sum of consecutive naturals, namely, 1856443 + ... + 1856446.

Almost surely, 2^7425778 is an apocalyptic number.

7425778 is a deficient number, since it is larger than the sum of its proper divisors (3712892).

7425778 is a wasteful number, since it uses less digits than its factorization.

7425778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3712891.

The product of its digits is 109760, while the sum is 40.

The square root of 7425778 is about 2725.0280732499. The cubic root of 7425778 is about 195.0955306628.

It can be divided in two parts, 74 and 25778, that added together give a palindrome (25852).

The spelling of 7425778 in words is "seven million, four hundred twenty-five thousand, seven hundred seventy-eight".