215130644 has 6 divisors (see below), whose sum is σ = 376478634. Its totient is φ = 107565320.

The previous prime is 215130637. The next prime is 215130647. The reversal of 215130644 is 446031512.

It can be written as a sum of positive squares in only one way, i.e., 204490000 + 10640644 = 14300^2 + 3262^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215130647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26891327 + ... + 26891334.

It is an arithmetic number, because the mean of its divisors is an integer number (62746439).

Almost surely, 2^215130644 is an apocalyptic number.

It is an amenable number.

215130644 is a deficient number, since it is larger than the sum of its proper divisors (161347990).

215130644 is a wasteful number, since it uses less digits than its factorization.

215130644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53782665 (or 53782663 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 215130644 is about 14667.3325454903. The cubic root of 215130644 is about 599.1939583872.

The spelling of 215130644 in words is "two hundred fifteen million, one hundred thirty thousand, six hundred forty-four".