78085261438 has 48 divisors (see below), whose sum is σ = 128556162000. Its totient is φ = 35431119360.

The previous prime is 78085261399. The next prime is 78085261439. The reversal of 78085261438 is 83416258087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78085261439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18909358 + ... + 18913486.

It is an arithmetic number, because the mean of its divisors is an integer number (2678253375).

Almost surely, 2^78085261438 is an apocalyptic number.

78085261438 is a deficient number, since it is larger than the sum of its proper divisors (50470900562).

78085261438 is a wasteful number, since it uses less digits than its factorization.

78085261438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4441 (or 4310 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 52.

The spelling of 78085261438 in words is "seventy-eight billion, eighty-five million, two hundred sixty-one thousand, four hundred thirty-eight".