7228386781 has 32 divisors (see below), whose sum is σ = 9238752000. Its totient is φ = 5492551680.

The previous prime is 7228386721. The next prime is 7228386853. The reversal of 7228386781 is 1876838227.

It is not a de Polignac number, because 7228386781 - 2¹¹ = 7228384733 is a prime.

It is a super-2 number, since 2×7228386781² (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 (7228386701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 493045 + ... + 507493.

It is an arithmetic number, because the mean of its divisors is an integer number (288711000).

Almost surely, 2^7228386781 is an apocalyptic number.

It is an amenable number.

7228386781 is a deficient number, since it is larger than the sum of its proper divisors (2010365219).

7228386781 is a wasteful number, since it uses less digits than its factorization.

7228386781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14629.

The product of its digits is 1806336, while the sum is 52.

The square root of 7228386781 is about 85019.9199070430. The cubic root of 7228386781 is about 1933.5131391992.

The spelling of 7228386781 in words is "seven billion, two hundred twenty-eight million, three hundred eighty-six thousand, seven hundred eighty-one".