278378091264 has 432 divisors, whose sum is σ = 947976196608. Its totient is φ = 71850369024.

The previous prime is 278378091227. The next prime is 278378091293. The reversal of 278378091264 is 462190873872.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22987099 + ... + 22999205.

It is an arithmetic number, because the mean of its divisors is an integer number (2194389344).

Almost surely, 2^278378091264 is an apocalyptic number.

278378091264 is a gapful number since it is divisible by the number (24) 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 278378091264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (473988098304).

278378091264 is an abundant number, since it is smaller than the sum of its proper divisors (669598105344).

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

278378091264 is a wasteful number, since it uses less digits than its factorization.

278378091264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12200 (or 12179 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 57.

The spelling of 278378091264 in words is "two hundred seventy-eight billion, three hundred seventy-eight million, ninety-one thousand, two hundred sixty-four".