78626642 has 4 divisors (see below), whose sum is σ = 117939966. Its totient is φ = 39313320.

The previous prime is 78626623. The next prime is 78626657. The reversal of 78626642 is 24662687.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42758521 + 35868121 = 6539^2 + 5989^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78626642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19656659 + ... + 19656662.

Almost surely, 2^78626642 is an apocalyptic number.

78626642 is a deficient number, since it is larger than the sum of its proper divisors (39313324).

78626642 is a wasteful number, since it uses less digits than its factorization.

78626642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39313323.

The product of its digits is 193536, while the sum is 41.

The square root of 78626642 is about 8867.1665147329. The cubic root of 78626642 is about 428.4070173907.

The spelling of 78626642 in words is "seventy-eight million, six hundred twenty-six thousand, six hundred forty-two".