78115725 has 24 divisors (see below), whose sum is σ = 143502720. Its totient is φ = 41661360.

The previous prime is 78115711. The next prime is 78115727. The reversal of 78115725 is 52751187.

78115725 is a `hidden beast` number, since 7 + 81 + 1 + 572 + 5 = 666.

It is not a de Polignac number, because 78115725 - 2¹² = 78111629 is a prime.

It is a super-2 number, since 2×78115725² = 12204132984551250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78115725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78115727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57189 + ... + 58538.

It is an arithmetic number, because the mean of its divisors is an integer number (5979280).

Almost surely, 2^78115725 is an apocalyptic number.

78115725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78115725 is a deficient number, since it is larger than the sum of its proper divisors (65386995).

78115725 is a wasteful number, since it uses less digits than its factorization.

78115725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115746 (or 115735 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 78115725 is about 8838.3100760270. The cubic root of 78115725 is about 427.4770686376.

The spelling of 78115725 in words is "seventy-eight million, one hundred fifteen thousand, seven hundred twenty-five".