2780747923 has 2 divisors, whose sum is σ = 2780747924. Its totient is φ = 2780747922.

The previous prime is 2780747897. The next prime is 2780747929. The reversal of 2780747923 is 3297470872.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2780747923 is a prime.

It is a super-2 number, since 2×2780747923² = 15465118022537627858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2780747929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390373961 + 1390373962.

It is an arithmetic number, because the mean of its divisors is an integer number (1390373962).

Almost surely, 2^2780747923 is an apocalyptic number.

2780747923 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780747923 is an equidigital number, since it uses as much as digits as its factorization.

2780747923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The square root of 2780747923 is about 52732.7974129953. The cubic root of 2780747923 is about 1406.2219538690.

The spelling of 2780747923 in words is "two billion, seven hundred eighty million, seven hundred forty-seven thousand, nine hundred twenty-three".