305813781378 has 24 divisors (see below), whose sum is σ = 757253173248. Its totient is φ = 87375366072.

The previous prime is 305813781323. The next prime is 305813781451. The reversal of 305813781378 is 873187318503.

It is a super-2 number, since 2×305813781378² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1213546626 + ... + 1213546877.

It is an arithmetic number, because the mean of its divisors is an integer number (31552215552).

Almost surely, 2^305813781378 is an apocalyptic number.

305813781378 is an abundant number, since it is smaller than the sum of its proper divisors (451439391870).

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

305813781378 is a wasteful number, since it uses less digits than its factorization.

305813781378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2427093518 (or 2427093515 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 305813781378 in words is "three hundred five billion, eight hundred thirteen million, seven hundred eighty-one thousand, three hundred seventy-eight".