213023778 has 32 divisors (see below), whose sum is σ = 465454080. Its totient is φ = 64458960.

The previous prime is 213023777. The next prime is 213023809. The reversal of 213023778 is 877320312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (213023771) 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 15 ways as a sum of consecutive naturals, for example, 53451 + ... + 57297.

It is an arithmetic number, because the mean of its divisors is an integer number (14545440).

Almost surely, 2^213023778 is an apocalyptic number.

213023778 is an abundant number, since it is smaller than the sum of its proper divisors (252430302).

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

213023778 is a wasteful number, since it uses less digits than its factorization.

213023778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4702.

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 213023778 is about 14595.3341174500. The cubic root of 213023778 is about 597.2314840694.

The spelling of 213023778 in words is "two hundred thirteen million, twenty-three thousand, seven hundred seventy-eight".