78786738 has 24 divisors (see below), whose sum is σ = 180746748. Its totient is φ = 24717312.

The previous prime is 78786737. The next prime is 78786761. The reversal of 78786738 is 83768787.

It can be written as a sum of positive squares in 2 ways, for example, as 76790169 + 1996569 = 8763^2 + 1413^2 .

It is not an unprimeable number, because it can be changed into a prime (78786733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128431 + ... + 129042.

Almost surely, 2^78786738 is an apocalyptic number.

78786738 is an abundant number, since it is smaller than the sum of its proper divisors (101960010).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78786738 is a wasteful number, since it uses less digits than its factorization.

78786738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257498 (or 257495 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 78786738 is about 8876.1893850909. The cubic root of 78786738 is about 428.6975879062.

It can be divided in two parts, 78786 and 738, that added together give a square (79524 = 282²).

The spelling of 78786738 in words is "seventy-eight million, seven hundred eighty-six thousand, seven hundred thirty-eight".