212561478 has 24 divisors (see below), whose sum is σ = 461149416. Its totient is φ = 70761600.

The previous prime is 212561477. The next prime is 212561509. The reversal of 212561478 is 874165212.

212561478 is a `hidden beast` number, since 2 + 125 + 61 + 478 = 666.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212561471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7318 + ... + 21878.

It is an arithmetic number, because the mean of its divisors is an integer number (19214559).

Almost surely, 2^212561478 is an apocalyptic number.

212561478 is an abundant number, since it is smaller than the sum of its proper divisors (248587938).

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

212561478 is a wasteful number, since it uses less digits than its factorization.

212561478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15380 (or 15377 counting only the distinct ones).

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

The square root of 212561478 is about 14579.4882626243. The cubic root of 212561478 is about 596.7991378343.

The spelling of 212561478 in words is "two hundred twelve million, five hundred sixty-one thousand, four hundred seventy-eight".