2378778731 has 4 divisors (see below), whose sum is σ = 2718604272. Its totient is φ = 2038953192.

The previous prime is 2378778709. The next prime is 2378778751. The reversal of 2378778731 is 1378778732.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2378778731 - 2⁶ = 2378778667 is a prime.

It is a super-2 number, since 2×2378778731² = 11317176502115940722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2378778751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169912760 + ... + 169912773.

It is an arithmetic number, because the mean of its divisors is an integer number (679651068).

Almost surely, 2^2378778731 is an apocalyptic number.

2378778731 is a deficient number, since it is larger than the sum of its proper divisors (339825541).

2378778731 is an equidigital number, since it uses as much as digits as its factorization.

2378778731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339825540.

The product of its digits is 2765952, while the sum is 53.

The square root of 2378778731 is about 48772.7252775565. The cubic root of 2378778731 is about 1334.9080404424.

Subtracting from 2378778731 its reverse (1378778732), we obtain a palindrome (999999999).

The spelling of 2378778731 in words is "two billion, three hundred seventy-eight million, seven hundred seventy-eight thousand, seven hundred thirty-one".