215725812 has 12 divisors (see below), whose sum is σ = 503360256. Its totient is φ = 71908600.

The previous prime is 215725789. The next prime is 215725813. The reversal of 215725812 is 218527512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215725813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8988564 + ... + 8988587.

It is an arithmetic number, because the mean of its divisors is an integer number (41946688).

Almost surely, 2^215725812 is an apocalyptic number.

It is an amenable number.

215725812 is an abundant number, since it is smaller than the sum of its proper divisors (287634444).

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

215725812 is a wasteful number, since it uses less digits than its factorization.

215725812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17977158 (or 17977156 counting only the distinct ones).

The product of its digits is 11200, while the sum is 33.

The square root of 215725812 is about 14687.6074293943. The cubic root of 215725812 is about 599.7460147232.

The spelling of 215725812 in words is "two hundred fifteen million, seven hundred twenty-five thousand, eight hundred twelve".