7278255533 has 8 divisors (see below), whose sum is σ = 7541119608. Its totient is φ = 7018873344.

The previous prime is 7278255527. The next prime is 7278255557. The reversal of 7278255533 is 3355528727.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2023020484 + 5255235049 = 44978^2 + 72493^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7278255533 - 2⁶ = 7278255469 is a prime.

It is a super-2 number, since 2×7278255533² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7278255503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 866216 + ... + 874577.

It is an arithmetic number, because the mean of its divisors is an integer number (942639951).

Almost surely, 2^7278255533 is an apocalyptic number.

It is an amenable number.

7278255533 is a deficient number, since it is larger than the sum of its proper divisors (262864075).

7278255533 is a wasteful number, since it uses less digits than its factorization.

7278255533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740943.

The product of its digits is 1764000, while the sum is 47.

The square root of 7278255533 is about 85312.6926840315. The cubic root of 7278255533 is about 1937.9493985119.

The spelling of 7278255533 in words is "seven billion, two hundred seventy-eight million, two hundred fifty-five thousand, five hundred thirty-three".