78822638 has 16 divisors (see below), whose sum is σ = 124040160. Its totient is φ = 37514400.

The previous prime is 78822631. The next prime is 78822647. The reversal of 78822638 is 83622887.

It is a super-2 number, since 2×78822638² = 12426016522558088, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78822631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5453 + ... + 13688.

It is an arithmetic number, because the mean of its divisors is an integer number (7752510).

Almost surely, 2^78822638 is an apocalyptic number.

78822638 is a deficient number, since it is larger than the sum of its proper divisors (45217522).

78822638 is a wasteful number, since it uses less digits than its factorization.

78822638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19243.

The product of its digits is 258048, while the sum is 44.

The square root of 78822638 is about 8878.2114189740. The cubic root of 78822638 is about 428.7626915299.

The spelling of 78822638 in words is "seventy-eight million, eight hundred twenty-two thousand, six hundred thirty-eight".