213523780 has 12 divisors (see below), whose sum is σ = 448399980. Its totient is φ = 85409504.

The previous prime is 213523741. The next prime is 213523787. The reversal of 213523780 is 87325312.

It can be written as a sum of positive squares in 2 ways, for example, as 57972996 + 155550784 = 7614^2 + 12472^2 .

It is not an unprimeable number, because it can be changed into a prime (213523787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5338075 + ... + 5338114.

It is an arithmetic number, because the mean of its divisors is an integer number (37366665).

Almost surely, 2^213523780 is an apocalyptic number.

213523780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213523780 is an abundant number, since it is smaller than the sum of its proper divisors (234876200).

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

213523780 is a wasteful number, since it uses less digits than its factorization.

213523780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10676198 (or 10676196 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 213523780 is about 14612.4529083929. The cubic root of 213523780 is about 597.6983859478.

The spelling of 213523780 in words is "two hundred thirteen million, five hundred twenty-three thousand, seven hundred eighty".