83628781 has 2 divisors, whose sum is σ = 83628782. Its totient is φ = 83628780.

The previous prime is 83628767. The next prime is 83628799. The reversal of 83628781 is 18782638.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76842756 + 6786025 = 8766^2 + 2605^2 .

It is a cyclic number.

It is not a de Polignac number, because 83628781 - 2⁵ = 83628749 is a prime.

It is a super-2 number, since 2×83628781² = 13987546023091922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83628751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41814390 + 41814391.

It is an arithmetic number, because the mean of its divisors is an integer number (41814391).

Almost surely, 2^83628781 is an apocalyptic number.

It is an amenable number.

83628781 is a deficient number, since it is larger than the sum of its proper divisors (1).

83628781 is an equidigital number, since it uses as much as digits as its factorization.

83628781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 83628781 is about 9144.8773091824. The cubic root of 83628781 is about 437.3058181528.

The spelling of 83628781 in words is "eighty-three million, six hundred twenty-eight thousand, seven hundred eighty-one".