78317880 has 64 divisors (see below), whose sum is σ = 236507040. Its totient is φ = 20746752.

The previous prime is 78317851. The next prime is 78317881. The reversal of 78317880 is 8871387.

It is a super-2 number, since 2×78317880² = 12267380655388800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78317881) 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 15 ways as a sum of consecutive naturals, for example, 16762 + ... + 20918.

Almost surely, 2^78317880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78317880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118253520).

78317880 is an abundant number, since it is smaller than the sum of its proper divisors (158189160).

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

78317880 is a wasteful number, since it uses less digits than its factorization.

78317880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4328 (or 4324 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 78317880 is about 8849.7389792016. The cubic root of 78317880 is about 427.8455057148.

It can be divided in two parts, 78317 and 880, that added together give a palindrome (79197).

The spelling of 78317880 in words is "seventy-eight million, three hundred seventeen thousand, eight hundred eighty".