8212878513 has 24 divisors (see below), whose sum is σ = 13566561216. Its totient is φ = 4690029600.

The previous prime is 8212878491. The next prime is 8212878521. The reversal of 8212878513 is 3158782128.

8212878513 is a `hidden beast` number, since 8 + 2 + 128 + 7 + 8 + 513 = 666.

It is not a de Polignac number, because 8212878513 - 2⁸ = 8212878257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8212878013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57483 + ... + 140463.

It is an arithmetic number, because the mean of its divisors is an integer number (565273384).

Almost surely, 2^8212878513 is an apocalyptic number.

It is an amenable number.

8212878513 is a deficient number, since it is larger than the sum of its proper divisors (5353682703).

8212878513 is a wasteful number, since it uses less digits than its factorization.

8212878513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84565 (or 84562 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 8212878513 is about 90624.9331751478. The cubic root of 8212878513 is about 2017.5848101696.

The spelling of 8212878513 in words is "eight billion, two hundred twelve million, eight hundred seventy-eight thousand, five hundred thirteen".