78251125 has 8 divisors (see below), whose sum is σ = 97657560. Its totient is φ = 62600800.

The previous prime is 78251123. The next prime is 78251141. The reversal of 78251125 is 52115287.

It can be written as a sum of positive squares in 4 ways, for example, as 15382084 + 62869041 = 3922^2 + 7929^2 .

It is not a de Polignac number, because 78251125 - 2¹ = 78251123 is a prime.

It is a super-2 number, since 2×78251125² = 12246477127531250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78251123) 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 in 7 ways as a sum of consecutive naturals, for example, 312880 + ... + 313129.

It is an arithmetic number, because the mean of its divisors is an integer number (12207195).

Almost surely, 2^78251125 is an apocalyptic number.

It is an amenable number.

78251125 is a deficient number, since it is larger than the sum of its proper divisors (19406435).

78251125 is an equidigital number, since it uses as much as digits as its factorization.

78251125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626024 (or 626014 counting only the distinct ones).

The product of its digits is 5600, while the sum is 31.

The square root of 78251125 is about 8845.9665950081. The cubic root of 78251125 is about 427.7239117472.

The spelling of 78251125 in words is "seventy-eight million, two hundred fifty-one thousand, one hundred twenty-five".