212043780 has 72 divisors (see below), whose sum is σ = 692683992. Its totient is φ = 52194816.

The previous prime is 212043763. The next prime is 212043791. The reversal of 212043780 is 87340212.

It can be written as a sum of positive squares in 4 ways, for example, as 49787136 + 162256644 = 7056^2 + 12738^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42969 + ... + 47648.

It is an arithmetic number, because the mean of its divisors is an integer number (9620611).

Almost surely, 2^212043780 is an apocalyptic number.

212043780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212043780 is an abundant number, since it is smaller than the sum of its proper divisors (480640212).

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

212043780 is a wasteful number, since it uses less digits than its factorization.

212043780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90645 (or 90640 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 212043780 is about 14561.7231123243. The cubic root of 212043780 is about 596.3142382960.

Adding to 212043780 its reverse (87340212), we get a palindrome (299383992).

The spelling of 212043780 in words is "two hundred twelve million, forty-three thousand, seven hundred eighty".