213640782 has 16 divisors (see below), whose sum is σ = 427505232. Its totient is φ = 71176320.

The previous prime is 213640781. The next prime is 213640783. The reversal of 213640782 is 287046312.

It is an interprime number because it is at equal distance from previous prime (213640781) and next prime (213640783).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213640781) 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 in 7 ways as a sum of consecutive naturals, for example, 4728 + ... + 21204.

It is an arithmetic number, because the mean of its divisors is an integer number (26719077).

Almost surely, 2^213640782 is an apocalyptic number.

213640782 is an abundant number, since it is smaller than the sum of its proper divisors (213864450).

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

213640782 is a wasteful number, since it uses less digits than its factorization.

213640782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18643.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 213640782 is about 14616.4558631701. The cubic root of 213640782 is about 597.8075371583.

The spelling of 213640782 in words is "two hundred thirteen million, six hundred forty thousand, seven hundred eighty-two".