278718109920 has 480 divisors, whose sum is σ = 998830103040. Its totient is φ = 73186467840.

The previous prime is 278718109919. The next prime is 278718110023. The reversal of 278718109920 is 29901817872.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 269813724 + ... + 269814756.

It is an arithmetic number, because the mean of its divisors is an integer number (2080896048).

Almost surely, 2^278718109920 is an apocalyptic number.

278718109920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278718109920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (499415051520).

278718109920 is an abundant number, since it is smaller than the sum of its proper divisors (720111993120).

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

278718109920 is a wasteful number, since it uses less digits than its factorization.

278718109920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 1343 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The spelling of 278718109920 in words is "two hundred seventy-eight billion, seven hundred eighteen million, one hundred nine thousand, nine hundred twenty".