7226778897 has 24 divisors (see below), whose sum is σ = 11902933224. Its totient is φ = 4185644544.

The previous prime is 7226778893. The next prime is 7226778901. The reversal of 7226778897 is 7988776227.

It is an interprime number because it is at equal distance from previous prime (7226778893) and next prime (7226778901).

It can be written as a sum of positive squares in 4 ways, for example, as 4498641 + 7222280256 = 2121^2 + 84984^2 .

It is not a de Polignac number, because 7226778897 - 2² = 7226778893 is a prime.

It is a super-2 number, since 2×7226778897² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7226778893) 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, 1814698 + ... + 1818675.

It is an arithmetic number, because the mean of its divisors is an integer number (495955551).

Almost surely, 2^7226778897 is an apocalyptic number.

It is an amenable number.

7226778897 is a deficient number, since it is larger than the sum of its proper divisors (4676154327).

7226778897 is a wasteful number, since it uses less digits than its factorization.

7226778897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633409 (or 3633406 counting only the distinct ones).

The product of its digits is 33191424, while the sum is 63.

The square root of 7226778897 is about 85010.4634559770. The cubic root of 7226778897 is about 1933.3697648671.

The spelling of 7226778897 in words is "seven billion, two hundred twenty-six million, seven hundred seventy-eight thousand, eight hundred ninety-seven".