7861978012 has 12 divisors (see below), whose sum is σ = 15723956080. Its totient is φ = 3369419136.

The previous prime is 7861978009. The next prime is 7861978073. The reversal of 7861978012 is 2108791687.

7861978012 is an admirable number.

It is a super-2 number, since 2×7861978012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140392437 + ... + 140392492.

Almost surely, 2^7861978012 is an apocalyptic number.

It is an amenable number.

7861978012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

7861978012 is a wasteful number, since it uses less digits than its factorization.

7861978012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280784940 (or 280784938 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 49.

The square root of 7861978012 is about 88667.7957998280. The cubic root of 7861978012 is about 1988.4313802066.

The spelling of 7861978012 in words is "seven billion, eight hundred sixty-one million, nine hundred seventy-eight thousand, twelve".