213664738 has 16 divisors (see below), whose sum is σ = 387828864. Its totient is φ = 86184000.

The previous prime is 213664697. The next prime is 213664739. The reversal of 213664738 is 837466312.

213664738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 213664738.

It is not an unprimeable number, because it can be changed into a prime (213664739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448638 + ... + 449113.

It is an arithmetic number, because the mean of its divisors is an integer number (24239304).

Almost surely, 2^213664738 is an apocalyptic number.

213664738 is a deficient number, since it is larger than the sum of its proper divisors (174164126).

213664738 is a wasteful number, since it uses less digits than its factorization.

213664738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 897777.

The product of its digits is 145152, while the sum is 40.

The square root of 213664738 is about 14617.2753275020. The cubic root of 213664738 is about 597.8298808045.

The spelling of 213664738 in words is "two hundred thirteen million, six hundred sixty-four thousand, seven hundred thirty-eight".