213785428 has 12 divisors (see below), whose sum is σ = 376215840. Its totient is φ = 106295192.

The previous prime is 213785423. The next prime is 213785431. The reversal of 213785428 is 824587312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213785423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148576 + ... + 150007.

It is an arithmetic number, because the mean of its divisors is an integer number (31351320).

Almost surely, 2^213785428 is an apocalyptic number.

It is an amenable number.

213785428 is a deficient number, since it is larger than the sum of its proper divisors (162430412).

213785428 is a wasteful number, since it uses less digits than its factorization.

213785428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298766 (or 298764 counting only the distinct ones).

The product of its digits is 107520, while the sum is 40.

The square root of 213785428 is about 14621.4030790482. The cubic root of 213785428 is about 597.9424223934.

The spelling of 213785428 in words is "two hundred thirteen million, seven hundred eighty-five thousand, four hundred twenty-eight".