7681687212 has 18 divisors (see below), whose sum is σ = 17924645284. Its totient is φ = 2560461200.

The previous prime is 7681687199. The next prime is 7681687231. The reversal of 7681687212 is 2127861867.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290962 + ... + 316262.

Almost surely, 2^7681687212 is an apocalyptic number.

It is an amenable number.

7681687212 is an abundant number, since it is smaller than the sum of its proper divisors (10242958072).

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

7681687212 is an frugal number, since it uses more digits than its factorization.

7681687212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50609 (or 25306 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 7681687212 is about 87645.2349646003. The cubic root of 7681687212 is about 1973.1141288371.

Multiplying 7681687212 by its sum of digits (48), we get a square (368720986176 = 607224²).

The spelling of 7681687212 in words is "seven billion, six hundred eighty-one million, six hundred eighty-seven thousand, two hundred twelve".