2147561280 has 168 divisors, whose sum is σ = 7481011200. Its totient is φ = 565373952.

The previous prime is 2147561243. The next prime is 2147561291. The reversal of 2147561280 is 821657412.

2147561280 is a `hidden beast` number, since 2 + 14 + 7 + 561 + 2 + 80 = 666.

It is a super-2 number, since 2×2147561280² = 9224038902710476800, which contains 22 as substring.

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

It is a congruent number.

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, 222801 + ... + 232239.

Almost surely, 2^2147561280 is an apocalyptic number.

2147561280 is a gapful number since it is divisible by the number (20) 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 2147561280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3740505600).

2147561280 is an abundant number, since it is smaller than the sum of its proper divisors (5333449920).

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

2147561280 is a wasteful number, since it uses less digits than its factorization.

2147561280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9541 (or 9528 counting only the distinct ones).

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

The square root of 2147561280 is about 46341.7876219725. The cubic root of 2147561280 is about 1290.1747014162.

The spelling of 2147561280 in words is "two billion, one hundred forty-seven million, five hundred sixty-one thousand, two hundred eighty".