78280255500 has 96 divisors (see below), whose sum is σ = 228064444608. Its totient is φ = 20864448000.

The previous prime is 78280255489. The next prime is 78280255549. The reversal of 78280255500 is 555208287.

It is a super-2 number, since 2×78280255500² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

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, 3319752 + ... + 3343248.

It is an arithmetic number, because the mean of its divisors is an integer number (2375671298).

Almost surely, 2^78280255500 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 78280255500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114032222304).

78280255500 is an abundant number, since it is smaller than the sum of its proper divisors (149784189108).

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

78280255500 is a wasteful number, since it uses less digits than its factorization.

78280255500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25740 (or 25728 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 42.

The spelling of 78280255500 in words is "seventy-eight billion, two hundred eighty million, two hundred fifty-five thousand, five hundred".