78120125 has 8 divisors (see below), whose sum is σ = 97494072. Its totient is φ = 62496000.

The previous prime is 78120109. The next prime is 78120131. The reversal of 78120125 is 52102187.

It can be written as a sum of positive squares in 4 ways, for example, as 27556 + 78092569 = 166^2 + 8837^2 .

It is not a de Polignac number, because 78120125 - 2⁴ = 78120109 is a prime.

It is a super-2 number, since 2×78120125² = 12205507860031250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78120094 and 78120103.

It is a congruent number.

It is an unprimeable number.

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, 312356 + ... + 312605.

It is an arithmetic number, because the mean of its divisors is an integer number (12186759).

Almost surely, 2^78120125 is an apocalyptic number.

It is an amenable number.

78120125 is a deficient number, since it is larger than the sum of its proper divisors (19373947).

78120125 is an equidigital number, since it uses as much as digits as its factorization.

78120125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624976 (or 624966 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 78120125 is about 8838.5589888850. The cubic root of 78120125 is about 427.4850946093.

The spelling of 78120125 in words is "seventy-eight million, one hundred twenty thousand, one hundred twenty-five".