78278841 has 24 divisors (see below), whose sum is σ = 119600000. Its totient is φ = 49198752.

The previous prime is 78278797. The next prime is 78278857. The reversal of 78278841 is 14887287.

It is not a de Polignac number, because 78278841 - 2⁶ = 78278777 is a prime.

It is a super-2 number, since 2×78278841² = 12255153896606562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78278861) 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 23 ways as a sum of consecutive naturals, for example, 38160 + ... + 40158.

Almost surely, 2^78278841 is an apocalyptic number.

It is an amenable number.

78278841 is a deficient number, since it is larger than the sum of its proper divisors (41321159).

78278841 is a wasteful number, since it uses less digits than its factorization.

78278841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253 (or 2250 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 78278841 is about 8847.5330459965. The cubic root of 78278841 is about 427.7744047234.

The spelling of 78278841 in words is "seventy-eight million, two hundred seventy-eight thousand, eight hundred forty-one".