228762280681 has 9 divisors (see below), whose sum is σ = 251455232119. Its totient is φ = 207960926800.

The previous prime is 228762280667. The next prime is 228762280711. The reversal of 228762280681 is 186082267822.

The square root of 228762280681 is 478291.

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

228762280681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 161370120681 + 67392160000 = 401709^2 + 259600^2 .

It is a de Polignac number, because none of the positive numbers 2^k-228762280681 is a prime.

It is a super-2 number, since 2×228762280681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228762280651) 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 8 ways as a sum of consecutive naturals, for example, 5239461 + ... + 5282941.

Almost surely, 2^228762280681 is an apocalyptic number.

228762280681 is the 478291-st square number.

228762280681 is the 239146-th centered octagonal number.

It is an amenable number.

228762280681 is a deficient number, since it is larger than the sum of its proper divisors (22692951438).

228762280681 is an frugal number, since it uses more digits than its factorization.

228762280681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86984 (or 43492 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 52.

The spelling of 228762280681 in words is "two hundred twenty-eight billion, seven hundred sixty-two million, two hundred eighty thousand, six hundred eighty-one".