278380645332 has 12 divisors (see below), whose sum is σ = 649554839136. Its totient is φ = 92793548440.

The previous prime is 278380645303. The next prime is 278380645339. The reversal of 278380645332 is 233546083872.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278380645339) 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 3 ways as a sum of consecutive naturals, for example, 11599193544 + ... + 11599193567.

It is an arithmetic number, because the mean of its divisors is an integer number (54129569928).

Almost surely, 2^278380645332 is an apocalyptic number.

It is an amenable number.

278380645332 is an abundant number, since it is smaller than the sum of its proper divisors (371174193804).

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

278380645332 is a wasteful number, since it uses less digits than its factorization.

278380645332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23198387118 (or 23198387116 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 51.

The spelling of 278380645332 in words is "two hundred seventy-eight billion, three hundred eighty million, six hundred forty-five thousand, three hundred thirty-two".