7722378 has 40 divisors (see below), whose sum is σ = 17567748. Its totient is φ = 2534976.

The previous prime is 7722373. The next prime is 7722383. The reversal of 7722378 is 8732277.

7722378 is nontrivially palindromic in base 11.

It is an interprime number because it is at equal distance from previous prime (7722373) and next prime (7722383).

It can be written as a sum of positive squares in 2 ways, for example, as 7634169 + 88209 = 2763^2 + 297^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7722371) 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 19 ways as a sum of consecutive naturals, for example, 11500 + ... + 12152.

Almost surely, 2^7722378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7722378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8783874).

7722378 is an abundant number, since it is smaller than the sum of its proper divisors (9845370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7722378 is a wasteful number, since it uses less digits than its factorization.

7722378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740 (or 731 counting only the distinct ones).

The product of its digits is 32928, while the sum is 36.

The square root of 7722378 is about 2778.9166954049. The cubic root of 7722378 is about 197.6591933389.

It can be divided in two parts, 7722 and 378, that added together give a square (8100 = 90²).

The spelling of 7722378 in words is "seven million, seven hundred twenty-two thousand, three hundred seventy-eight".