78548121 has 6 divisors (see below), whose sum is σ = 113458410. Its totient is φ = 52365408.

The previous prime is 78548117. The next prime is 78548131. The reversal of 78548121 is 12184587.

It can be written as a sum of positive squares in only one way, i.e., 43086096 + 35462025 = 6564^2 + 5955^2 .

It is not a de Polignac number, because 78548121 - 2² = 78548117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78548111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4363776 + ... + 4363793.

It is an arithmetic number, because the mean of its divisors is an integer number (18909735).

Almost surely, 2^78548121 is an apocalyptic number.

It is an amenable number.

78548121 is a deficient number, since it is larger than the sum of its proper divisors (34910289).

78548121 is a wasteful number, since it uses less digits than its factorization.

78548121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8727575 (or 8727572 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 78548121 is about 8862.7377824237. The cubic root of 78548121 is about 428.2643594201.

The spelling of 78548121 in words is "seventy-eight million, five hundred forty-eight thousand, one hundred twenty-one".