278093238381 has 24 divisors (see below), whose sum is σ = 461890977600. Its totient is φ = 157935505536.

The previous prime is 278093238307. The next prime is 278093238407. The reversal of 278093238381 is 183832390872.

278093238381 is a `hidden beast` number, since 27 + 8 + 0 + 9 + 3 + 238 + 381 = 666.

It is not a de Polignac number, because 278093238381 - 2¹⁴ = 278093221997 is a prime.

It is a super-2 number, since 2×278093238381² (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 (278093234381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13530156 + ... + 13550693.

It is an arithmetic number, because the mean of its divisors is an integer number (19245457400).

Almost surely, 2^278093238381 is an apocalyptic number.

278093238381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

278093238381 is a deficient number, since it is larger than the sum of its proper divisors (183797739219).

278093238381 is a wasteful number, since it uses less digits than its factorization.

278093238381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27081025 (or 27081022 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 278093238381 in words is "two hundred seventy-eight billion, ninety-three million, two hundred thirty-eight thousand, three hundred eighty-one".