78878587787220 has 384 divisors, whose sum is σ = 270735536332800. Its totient is φ = 16943987662848.

The previous prime is 78878587787177. The next prime is 78878587787249. The reversal of 78878587787220 is 2278778587887.

It is a super-2 number, since 2×78878587787220² (a number of 29 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 127 ways as a sum of consecutive naturals, for example, 8510491 + ... + 15171869.

It is an arithmetic number, because the mean of its divisors is an integer number (705040459200).

Almost surely, 2^{78878587787220} 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 78878587787220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135367768166400).

78878587787220 is an abundant number, since it is smaller than the sum of its proper divisors (191856948545580).

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

78878587787220 is a wasteful number, since it uses less digits than its factorization.

78878587787220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6661487 (or 6661485 counting only the distinct ones).

The product of its (nonzero) digits is 11014635520, while the sum is 84.

The spelling of 78878587787220 in words is "seventy-eight trillion, eight hundred seventy-eight billion, five hundred eighty-seven million, seven hundred eighty-seven thousand, two hundred twenty".