820671412 has 12 divisors (see below), whose sum is σ = 1566736416. Its totient is φ = 373032440.

The previous prime is 820671407. The next prime is 820671421. The reversal of 820671412 is 214176028.

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, 9325768 + ... + 9325855.

It is an arithmetic number, because the mean of its divisors is an integer number (130561368).

Almost surely, 2^820671412 is an apocalyptic number.

It is an amenable number.

820671412 is a deficient number, since it is larger than the sum of its proper divisors (746065004).

820671412 is a wasteful number, since it uses less digits than its factorization.

820671412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18651638 (or 18651636 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 820671412 is about 28647.3630898203. The cubic root of 820671412 is about 936.2455540153.

The spelling of 820671412 in words is "eight hundred twenty million, six hundred seventy-one thousand, four hundred twelve".