78511217008 has 160 divisors (see below), whose sum is σ = 183251414016. Its totient is φ = 31880024064.

The previous prime is 78511216957. The next prime is 78511217041. The reversal of 78511217008 is 80071211587.

It is a super-2 number, since 2×78511217008² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105667485 + ... + 105668227.

Almost surely, 2^78511217008 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 78511217008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91625707008).

78511217008 is an abundant number, since it is smaller than the sum of its proper divisors (104740197008).

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

78511217008 is a wasteful number, since it uses less digits than its factorization.

78511217008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431 (or 1425 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 40.

The spelling of 78511217008 in words is "seventy-eight billion, five hundred eleven million, two hundred seventeen thousand, eight".