78638022 has 48 divisors (see below), whose sum is σ = 182744640. Its totient is φ = 24350976.

The previous prime is 78638011. The next prime is 78638033. The reversal of 78638022 is 22083687.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78638011) and next prime (78638033).

It is a congruent number.

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 in 23 ways as a sum of consecutive naturals, for example, 22548 + ... + 25800.

It is an arithmetic number, because the mean of its divisors is an integer number (3807180).

Almost surely, 2^78638022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78638022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91372320).

78638022 is an abundant number, since it is smaller than the sum of its proper divisors (104106618).

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

78638022 is a wasteful number, since it uses less digits than its factorization.

78638022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357 (or 3354 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 78638022 is about 8867.8081846643. The cubic root of 78638022 is about 428.4276848411.

The spelling of 78638022 in words is "seventy-eight million, six hundred thirty-eight thousand, twenty-two".