78407449368 has 128 divisors (see below), whose sum is σ = 209503869120. Its totient is φ = 24367841280.

The previous prime is 78407449313. The next prime is 78407449369. The reversal of 78407449368 is 86394470487.

It is a super-2 number, since 2×78407449368² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78407449369) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20453980 + ... + 20457812.

Almost surely, 2^78407449368 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 78407449368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104751934560).

78407449368 is an abundant number, since it is smaller than the sum of its proper divisors (131096419752).

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

78407449368 is a wasteful number, since it uses less digits than its factorization.

78407449368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317 (or 4313 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 60.

The spelling of 78407449368 in words is "seventy-eight billion, four hundred seven million, four hundred forty-nine thousand, three hundred sixty-eight".