8491274378 has 8 divisors (see below), whose sum is σ = 12738822372. Its totient is φ = 4245000256.

The previous prime is 8491274377. The next prime is 8491274417. The reversal of 8491274378 is 8734721948.

8491274378 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8390010409 + 101263969 = 91597^2 + 10063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8491274377) 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, 301625 + ... + 328572.

Almost surely, 2^8491274378 is an apocalyptic number.

8491274378 is a deficient number, since it is larger than the sum of its proper divisors (4247547994).

8491274378 is a wasteful number, since it uses less digits than its factorization.

8491274378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636936.

The product of its digits is 2709504, while the sum is 53.

The square root of 8491274378 is about 92148.1110929573. Note that the first 3 decimals coincide. The cubic root of 8491274378 is about 2040.1289789334.

The spelling of 8491274378 in words is "eight billion, four hundred ninety-one million, two hundred seventy-four thousand, three hundred seventy-eight".