2147281920 has 528 divisors, whose sum is σ = 8904941280. Its totient is φ = 489259008.

The previous prime is 2147281879. The next prime is 2147281921. The reversal of 2147281920 is 291827412.

2147281920 is a `hidden beast` number, since 21 + 472 + 81 + 92 + 0 = 666.

It is a super-2 number, since 2×2147281920² = 9221639287917772800, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (2147281921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6773602 + ... + 6773918.

Almost surely, 2^2147281920 is an apocalyptic number.

2147281920 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 2147281920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4452470640).

2147281920 is an abundant number, since it is smaller than the sum of its proper divisors (6757659360).

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

2147281920 is a wasteful number, since it uses less digits than its factorization.

2147281920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 2147281920 is about 46338.7733976634. The cubic root of 2147281920 is about 1290.1187559681.

The spelling of 2147281920 in words is "two billion, one hundred forty-seven million, two hundred eighty-one thousand, nine hundred twenty".