7487934215281 has 27 divisors (see below), whose sum is σ = 8334765794691. Its totient is φ = 6723947977344.

The previous prime is 7487934215261. The next prime is 7487934215297. The reversal of 7487934215281 is 1825124397847.

It is a happy number.

The square root of 7487934215281 is 2736409.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 162900224881 + 7325033990400 = 403609^2 + 2706480^2 .

It is not a de Polignac number, because 7487934215281 - 2¹⁵ = 7487934182513 is a prime.

It is a super-2 number, since 2×7487934215281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7487934215261) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1316209885 + ... + 1316215573.

It is an arithmetic number, because the mean of its divisors is an integer number (308695029433).

Almost surely, 2^{7487934215281} is an apocalyptic number.

7487934215281 is the 2736409-th square number.

7487934215281 is the 1368205-th centered octagonal number.

It is an amenable number.

7487934215281 is a deficient number, since it is larger than the sum of its proper divisors (846831579410).

7487934215281 is an frugal number, since it uses more digits than its factorization.

7487934215281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11478 (or 5739 counting only the distinct ones).

The product of its digits is 27095040, while the sum is 61.

The spelling of 7487934215281 in words is "seven trillion, four hundred eighty-seven billion, nine hundred thirty-four million, two hundred fifteen thousand, two hundred eighty-one".