78917910 has 64 divisors (see below), whose sum is σ = 201636864. Its totient is φ = 19699200.

The previous prime is 78917873. The next prime is 78917921. The reversal of 78917910 is 1971987.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 137925 + ... + 138495.

It is an arithmetic number, because the mean of its divisors is an integer number (3150576).

Almost surely, 2^78917910 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78917910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100818432).

78917910 is an abundant number, since it is smaller than the sum of its proper divisors (122718954).

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

78917910 is a wasteful number, since it uses less digits than its factorization.

78917910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869.

The product of its (nonzero) digits is 31752, while the sum is 42.

The square root of 78917910 is about 8883.5752937655. The cubic root of 78917910 is about 428.9353687932.

The spelling of 78917910 in words is "seventy-eight million, nine hundred seventeen thousand, nine hundred ten".