7427281281 has 24 divisors (see below), whose sum is σ = 11631731904. Its totient is φ = 4202946720.

The previous prime is 7427281237. The next prime is 7427281291. The reversal of 7427281281 is 1821827247.

It is not a de Polignac number, because 7427281281 - 2²⁵ = 7393726849 is a prime.

It is a super-2 number, since 2×7427281281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7427281231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230130 + ... + 260411.

It is an arithmetic number, because the mean of its divisors is an integer number (484655496).

Almost surely, 2^7427281281 is an apocalyptic number.

It is an amenable number.

7427281281 is a deficient number, since it is larger than the sum of its proper divisors (4204450623).

7427281281 is a wasteful number, since it uses less digits than its factorization.

7427281281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490661 (or 490654 counting only the distinct ones).

The product of its digits is 100352, while the sum is 42.

The square root of 7427281281 is about 86181.6760164247. The cubic root of 7427281281 is about 1951.0869487783.

The spelling of 7427281281 in words is "seven billion, four hundred twenty-seven million, two hundred eighty-one thousand, two hundred eighty-one".