1210561880 has 64 divisors (see below), whose sum is σ = 2989785600. Its totient is φ = 437477760.

The previous prime is 1210561853. The next prime is 1210561903. The reversal of 1210561880 is 881650121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63281 + ... + 80159.

It is an arithmetic number, because the mean of its divisors is an integer number (46715400).

Almost surely, 2^1210561880 is an apocalyptic number.

1210561880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1210561880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1494892800).

1210561880 is an abundant number, since it is smaller than the sum of its proper divisors (1779223720).

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

1210561880 is a wasteful number, since it uses less digits than its factorization.

1210561880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17064 (or 17060 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 1210561880 is about 34793.1297816106. The cubic root of 1210561880 is about 1065.7671535520.

The spelling of 1210561880 in words is "one billion, two hundred ten million, five hundred sixty-one thousand, eight hundred eighty".