78742516 has 12 divisors (see below), whose sum is σ = 137942532. Its totient is φ = 39330368.

The previous prime is 78742493. The next prime is 78742519. The reversal of 78742516 is 61524787.

It can be written as a sum of positive squares in 2 ways, for example, as 2250000 + 76492516 = 1500^2 + 8746^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78742519) 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 3 ways as a sum of consecutive naturals, for example, 5665 + ... + 13768.

It is an arithmetic number, because the mean of its divisors is an integer number (11495211).

Almost surely, 2^78742516 is an apocalyptic number.

It is an amenable number.

78742516 is a deficient number, since it is larger than the sum of its proper divisors (59200016).

78742516 is a wasteful number, since it uses less digits than its factorization.

78742516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20450 (or 20448 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 78742516 is about 8873.6979890010. The cubic root of 78742516 is about 428.6173653829.

The spelling of 78742516 in words is "seventy-eight million, seven hundred forty-two thousand, five hundred sixteen".