78725101 has 16 divisors (see below), whose sum is σ = 97484800. Its totient is φ = 62275824.

The previous prime is 78725099. The next prime is 78725107. The reversal of 78725101 is 10152787.

It is a happy number.

It is not a de Polignac number, because 78725101 - 2¹ = 78725099 is a prime.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78725107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12820 + ... + 17938.

It is an arithmetic number, because the mean of its divisors is an integer number (6092800).

Almost surely, 2^78725101 is an apocalyptic number.

It is an amenable number.

78725101 is a deficient number, since it is larger than the sum of its proper divisors (18759699).

78725101 is an equidigital number, since it uses as much as digits as its factorization.

78725101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5165 (or 5139 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 78725101 is about 8872.7166640212. The cubic root of 78725101 is about 428.5857648273.

Adding to 78725101 its reverse (10152787), we get a palindrome (88877888).

The spelling of 78725101 in words is "seventy-eight million, seven hundred twenty-five thousand, one hundred one".