6861287412 has 240 divisors, whose sum is σ = 22085640192. Its totient is φ = 1814218560.

The previous prime is 6861287401. The next prime is 6861287449. The reversal of 6861287412 is 2147821686.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1614963 + ... + 1619205.

Almost surely, 2^6861287412 is an apocalyptic number.

6861287412 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6861287412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11042820096).

6861287412 is an abundant number, since it is smaller than the sum of its proper divisors (15224352780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6861287412 is a wasteful number, since it uses less digits than its factorization.

6861287412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320 (or 4309 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 6861287412 is about 82832.8884682890. Note that the first 3 decimals coincide. The cubic root of 6861287412 is about 1900.2111872364.

The spelling of 6861287412 in words is "six billion, eight hundred sixty-one million, two hundred eighty-seven thousand, four hundred twelve".