7280441257 has 4 divisors (see below), whose sum is σ = 7311688020. Its totient is φ = 7249194496.

The previous prime is 7280441239. The next prime is 7280441281. The reversal of 7280441257 is 7521440827.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4578416896 + 2702024361 = 67664^2 + 51981^2 .

It is a cyclic number.

It is not a de Polignac number, because 7280441257 - 2²³ = 7272052649 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7280441227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15623032 + ... + 15623497.

It is an arithmetic number, because the mean of its divisors is an integer number (1827922005).

Almost surely, 2^7280441257 is an apocalyptic number.

It is an amenable number.

7280441257 is a deficient number, since it is larger than the sum of its proper divisors (31246763).

7280441257 is a wasteful number, since it uses less digits than its factorization.

7280441257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31246762.

The product of its (nonzero) digits is 125440, while the sum is 40.

The square root of 7280441257 is about 85325.5017975283. The cubic root of 7280441257 is about 1938.1433734987.

The spelling of 7280441257 in words is "seven billion, two hundred eighty million, four hundred forty-one thousand, two hundred fifty-seven".