78315522 has 8 divisors (see below), whose sum is σ = 156631056. Its totient is φ = 26105172.

The previous prime is 78315509. The next prime is 78315551. The reversal of 78315522 is 22551387.

It is a sphenic number, since it is the product of 3 distinct primes.

78315522 is an admirable number.

It is a super-2 number, since 2×78315522² = 12266641972264968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6526288 + ... + 6526299.

It is an arithmetic number, because the mean of its divisors is an integer number (19578882).

Almost surely, 2^78315522 is an apocalyptic number.

78315522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78315522 is a wasteful number, since it uses less digits than its factorization.

78315522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13052592.

The product of its digits is 16800, while the sum is 33.

The square root of 78315522 is about 8849.6057539305. The cubic root of 78315522 is about 427.8412118046.

The spelling of 78315522 in words is "seventy-eight million, three hundred fifteen thousand, five hundred twenty-two".