212560815780 has 36 divisors (see below), whose sum is σ = 644767808412. Its totient is φ = 56682884160.

The previous prime is 212560815739. The next prime is 212560815827. The reversal of 212560815780 is 87518065212.

212560815780 is a `hidden beast` number, since 2 + 1 + 2 + 560 + 8 + 1 + 5 + 7 + 80 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 68331005604 + 144229810176 = 261402^2 + 379776^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 590446531 + ... + 590446890.

Almost surely, 2^212560815780 is an apocalyptic number.

212560815780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212560815780 is an abundant number, since it is smaller than the sum of its proper divisors (432206992632).

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

212560815780 is a wasteful number, since it uses less digits than its factorization.

212560815780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180893436 (or 1180893431 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 212560815780 in words is "two hundred twelve billion, five hundred sixty million, eight hundred fifteen thousand, seven hundred eighty".