1378078825 has 24 divisors (see below), whose sum is σ = 1729811160. Its totient is φ = 1088985600.

The previous prime is 1378078813. The next prime is 1378078829. The reversal of 1378078825 is 5288708731.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 486996624 + 891082201 = 22068^2 + 29851^2 .

It is not a de Polignac number, because 1378078825 - 2⁷ = 1378078697 is a prime.

It is a super-3 number, since 3×1378078825³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1378078829) 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 23 ways as a sum of consecutive naturals, for example, 1255677 + ... + 1256773.

It is an arithmetic number, because the mean of its divisors is an integer number (72075465).

Almost surely, 2^1378078825 is an apocalyptic number.

It is an amenable number.

1378078825 is a deficient number, since it is larger than the sum of its proper divisors (351732335).

1378078825 is a wasteful number, since it uses less digits than its factorization.

1378078825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677 (or 1672 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 49.

The square root of 1378078825 is about 37122.4840898343. The cubic root of 1378078825 is about 1112.8193957320.

The spelling of 1378078825 in words is "one billion, three hundred seventy-eight million, seventy-eight thousand, eight hundred twenty-five".