78315822 has 80 divisors (see below), whose sum is σ = 193807152. Its totient is φ = 23483520.

The previous prime is 78315803. The next prime is 78315823. The reversal of 78315822 is 22851387.

78315822 is a `hidden beast` number, since 78 + 3 + 1 + 582 + 2 = 666.

It is a super-2 number, since 2×78315822² = 12266735951071368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78315823) 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 39 ways as a sum of consecutive naturals, for example, 85893 + ... + 86799.

Almost surely, 2^78315822 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78315822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96903576).

78315822 is an abundant number, since it is smaller than the sum of its proper divisors (115491330).

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

78315822 is a wasteful number, since it uses less digits than its factorization.

78315822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975 (or 966 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 78315822 is about 8849.6227038219. The cubic root of 78315822 is about 427.8417581084.

The spelling of 78315822 in words is "seventy-eight million, three hundred fifteen thousand, eight hundred twenty-two".