78388872 has 32 divisors (see below), whose sum is σ = 196236000. Its totient is φ = 26094464.

The previous prime is 78388859. The next prime is 78388873. The reversal of 78388872 is 27888387.

It is a happy number.

It is a super-2 number, since 2×78388872² = 12289630506864768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78388873) 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 7 ways as a sum of consecutive naturals, for example, 21004 + ... + 24452.

It is an arithmetic number, because the mean of its divisors is an integer number (6132375).

Almost surely, 2^78388872 is an apocalyptic number.

It is an amenable number.

78388872 is an abundant number, since it is smaller than the sum of its proper divisors (117847128).

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

78388872 is a wasteful number, since it uses less digits than its factorization.

78388872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405 (or 4401 counting only the distinct ones).

The product of its digits is 1204224, while the sum is 51.

The square root of 78388872 is about 8853.7490364252. The cubic root of 78388872 is about 427.9747415728.

The spelling of 78388872 in words is "seventy-eight million, three hundred eighty-eight thousand, eight hundred seventy-two".