78210125 has 36 divisors (see below), whose sum is σ = 114555636. Its totient is φ = 53155200.

The previous prime is 78210109. The next prime is 78210131. The reversal of 78210125 is 52101287.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 6 ways, for example, as 70795396 + 7414729 = 8414^2 + 2723^2 .

It is not a de Polignac number, because 78210125 - 2⁴ = 78210109 is a prime.

It is a super-2 number, since 2×78210125² = 12233647305031250, 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 = 78210094 and 78210103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 692069 + ... + 692181.

It is an arithmetic number, because the mean of its divisors is an integer number (3182101).

Almost surely, 2^78210125 is an apocalyptic number.

It is an amenable number.

78210125 is a deficient number, since it is larger than the sum of its proper divisors (36345511).

78210125 is an equidigital number, since it uses as much as digits as its factorization.

78210125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 125 counting only the distinct ones).

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

The square root of 78210125 is about 8843.6488510117. The cubic root of 78210125 is about 427.6491961267.

The spelling of 78210125 in words is "seventy-eight million, two hundred ten thousand, one hundred twenty-five".