78561308 has 18 divisors (see below), whose sum is σ = 159928776. Its totient is φ = 33669048.

The previous prime is 78561283. The next prime is 78561331. The reversal of 78561308 is 80316587.

It is a super-2 number, since 2×78561308² = 12343758229341728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 200216 + ... + 200607.

It is an arithmetic number, because the mean of its divisors is an integer number (8884932).

Almost surely, 2^78561308 is an apocalyptic number.

It is an amenable number.

78561308 is an abundant number, since it is smaller than the sum of its proper divisors (81367468).

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

78561308 is a wasteful number, since it uses less digits than its factorization.

78561308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400841 (or 400832 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 78561308 is about 8863.4817086741. The cubic root of 78561308 is about 428.2883243731.

The spelling of 78561308 in words is "seventy-eight million, five hundred sixty-one thousand, three hundred eight".