78520025 has 12 divisors (see below), whose sum is σ = 103092732. Its totient is φ = 59120640.

The previous prime is 78520019. The next prime is 78520051. The reversal of 78520025 is 52002587.

It can be written as a sum of positive squares in 6 ways, for example, as 6405961 + 72114064 = 2531^2 + 8492^2 .

It is not a de Polignac number, because 78520025 - 2²² = 74325721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78520025.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91952 + ... + 92801.

It is an arithmetic number, because the mean of its divisors is an integer number (8591061).

Almost surely, 2^78520025 is an apocalyptic number.

It is an amenable number.

78520025 is a deficient number, since it is larger than the sum of its proper divisors (24572707).

78520025 is a wasteful number, since it uses less digits than its factorization.

78520025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184780 (or 184775 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 78520025 is about 8861.1525774021. The cubic root of 78520025 is about 428.2132911483.

The spelling of 78520025 in words is "seventy-eight million, five hundred twenty thousand, twenty-five".