213788728 has 8 divisors (see below), whose sum is σ = 400853880. Its totient is φ = 106894360.

The previous prime is 213788689. The next prime is 213788737. The reversal of 213788728 is 827887312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 13361788 + ... + 13361803.

It is an arithmetic number, because the mean of its divisors is an integer number (50106735).

Almost surely, 2^213788728 is an apocalyptic number.

It is an amenable number.

213788728 is a deficient number, since it is larger than the sum of its proper divisors (187065152).

213788728 is a wasteful number, since it uses less digits than its factorization.

213788728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26723597 (or 26723593 counting only the distinct ones).

The product of its digits is 301056, while the sum is 46.

The square root of 213788728 is about 14621.5159268798. The cubic root of 213788728 is about 597.9454989983.

The spelling of 213788728 in words is "two hundred thirteen million, seven hundred eighty-eight thousand, seven hundred twenty-eight".