78056121 has 32 divisors (see below), whose sum is σ = 124612992. Its totient is φ = 42831360.

The previous prime is 78056117. The next prime is 78056131. The reversal of 78056121 is 12165087.

It is not a de Polignac number, because 78056121 - 2² = 78056117 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (78056101) 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 31 ways as a sum of consecutive naturals, for example, 21021 + ... + 24453.

It is an arithmetic number, because the mean of its divisors is an integer number (3894156).

Almost surely, 2^78056121 is an apocalyptic number.

It is an amenable number.

78056121 is a deficient number, since it is larger than the sum of its proper divisors (46556871).

78056121 is a wasteful number, since it uses less digits than its factorization.

78056121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3513.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 78056121 is about 8834.9375210015. The cubic root of 78056121 is about 427.3683162006.

The spelling of 78056121 in words is "seventy-eight million, fifty-six thousand, one hundred twenty-one".