8491778247 has 16 divisors (see below), whose sum is σ = 11437487360. Its totient is φ = 5603677632.

The previous prime is 8491778213. The next prime is 8491778287. The reversal of 8491778247 is 7428771948.

It is not a de Polignac number, because 8491778247 - 2²² = 8487583943 is a prime.

It is a super-3 number, since 3×8491778247³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8491778287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 878004 + ... + 887622.

It is an arithmetic number, because the mean of its divisors is an integer number (714842960).

Almost surely, 2^8491778247 is an apocalyptic number.

8491778247 is a deficient number, since it is larger than the sum of its proper divisors (2945709113).

8491778247 is a wasteful number, since it uses less digits than its factorization.

8491778247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12582.

The product of its digits is 6322176, while the sum is 57.

The square root of 8491778247 is about 92150.8450693752. The cubic root of 8491778247 is about 2040.1693316285.

The spelling of 8491778247 in words is "eight billion, four hundred ninety-one million, seven hundred seventy-eight thousand, two hundred forty-seven".