212758380 has 48 divisors (see below), whose sum is σ = 661916640. Its totient is φ = 56735424.

The previous prime is 212758379. The next prime is 212758411. The reversal of 212758380 is 83857212.

212758380 is a `hidden beast` number, since 2 + 1 + 275 + 8 + 380 = 666.

It is a super-2 number, since 2×212758380² = 90532256520448800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196459 + ... + 197538.

It is an arithmetic number, because the mean of its divisors is an integer number (13789930).

Almost surely, 2^212758380 is an apocalyptic number.

212758380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212758380 is an abundant number, since it is smaller than the sum of its proper divisors (449158260).

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

212758380 is a wasteful number, since it uses less digits than its factorization.

212758380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394015 (or 394007 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 212758380 is about 14586.2394056864. The cubic root of 212758380 is about 596.9833585422.

The spelling of 212758380 in words is "two hundred twelve million, seven hundred fifty-eight thousand, three hundred eighty".