212765620 has 24 divisors (see below), whose sum is σ = 451418184. Its totient is φ = 84228096.

The previous prime is 212765611. The next prime is 212765627. The reversal of 212765620 is 26567212.

It can be written as a sum of positive squares in 4 ways, for example, as 4309776 + 208455844 = 2076^2 + 14438^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212765627) 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, 52897 + ... + 56776.

It is an arithmetic number, because the mean of its divisors is an integer number (18809091).

Almost surely, 2^212765620 is an apocalyptic number.

212765620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212765620 is an abundant number, since it is smaller than the sum of its proper divisors (238652564).

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

212765620 is a wasteful number, since it uses less digits than its factorization.

212765620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109779 (or 109777 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 212765620 is about 14586.4875826910. The cubic root of 212765620 is about 596.9901300898.

It can be divided in two parts, 21276 and 5620, that added together give a square (26896 = 164²).

The spelling of 212765620 in words is "two hundred twelve million, seven hundred sixty-five thousand, six hundred twenty".