213540788 has 6 divisors (see below), whose sum is σ = 373696386. Its totient is φ = 106770392.

The previous prime is 213540781. The next prime is 213540793. The reversal of 213540788 is 887045312.

It can be written as a sum of positive squares in only one way, i.e., 147573904 + 65966884 = 12148^2 + 8122^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213540781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26692595 + ... + 26692602.

It is an arithmetic number, because the mean of its divisors is an integer number (62282731).

Almost surely, 2^213540788 is an apocalyptic number.

It is an amenable number.

213540788 is a deficient number, since it is larger than the sum of its proper divisors (160155598).

213540788 is a wasteful number, since it uses less digits than its factorization.

213540788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53385201 (or 53385199 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 213540788 is about 14613.0348661734. The cubic root of 213540788 is about 597.7142551939.

The spelling of 213540788 in words is "two hundred thirteen million, five hundred forty thousand, seven hundred eighty-eight".