78105256 has 8 divisors (see below), whose sum is σ = 146447370. Its totient is φ = 39052624.

The previous prime is 78105253. The next prime is 78105271. The reversal of 78105256 is 65250187.

It can be written as a sum of positive squares in only one way, i.e., 76282756 + 1822500 = 8734^2 + 1350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78105256² = 12200862029651072, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78105253) 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 as a sum of consecutive naturals, namely, 4881571 + ... + 4881586.

Almost surely, 2^78105256 is an apocalyptic number.

It is an amenable number.

78105256 is a deficient number, since it is larger than the sum of its proper divisors (68342114).

78105256 is a wasteful number, since it uses less digits than its factorization.

78105256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9763163 (or 9763159 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 78105256 is about 8837.7178049539. The cubic root of 78105256 is about 427.4579710856.

The spelling of 78105256 in words is "seventy-eight million, one hundred five thousand, two hundred fifty-six".