278408378382 has 16 divisors (see below), whose sum is σ = 557558199552. Its totient is φ = 92679219000.

The previous prime is 278408378357. The next prime is 278408378383. The reversal of 278408378382 is 283873804872.

It is a super-2 number, since 2×278408378382² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278408378383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30888568 + ... + 30897579.

It is an arithmetic number, because the mean of its divisors is an integer number (34847387472).

Almost surely, 2^278408378382 is an apocalyptic number.

278408378382 is an abundant number, since it is smaller than the sum of its proper divisors (279149821170).

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

278408378382 is a wasteful number, since it uses less digits than its factorization.

278408378382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61786903.

The product of its (nonzero) digits is 28901376, while the sum is 60.

The spelling of 278408378382 in words is "two hundred seventy-eight billion, four hundred eight million, three hundred seventy-eight thousand, three hundred eighty-two".