78855481 has 4 divisors (see below), whose sum is σ = 78906100. Its totient is φ = 78804864.

The previous prime is 78855457. The next prime is 78855499. The reversal of 78855481 is 18455887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18455887 = 67 ⋅275461.

It can be written as a sum of positive squares in 2 ways, for example, as 35295481 + 43560000 = 5941^2 + 6600^2 .

It is a cyclic number.

It is not a de Polignac number, because 78855481 - 2⁷ = 78855353 is a prime.

It is a super-2 number, since 2×78855481² = 12436373767482722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78855451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22896 + ... + 26113.

It is an arithmetic number, because the mean of its divisors is an integer number (19726525).

Almost surely, 2^78855481 is an apocalyptic number.

It is an amenable number.

78855481 is a deficient number, since it is larger than the sum of its proper divisors (50619).

78855481 is a wasteful number, since it uses less digits than its factorization.

78855481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50618.

The product of its digits is 358400, while the sum is 46.

The square root of 78855481 is about 8880.0608669085. The cubic root of 78855481 is about 428.8222340592.

It can be divided in two parts, 7885 and 5481, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 78855481 in words is "seventy-eight million, eight hundred fifty-five thousand, four hundred eighty-one".