76639481 has 2 divisors, whose sum is σ = 76639482. Its totient is φ = 76639480.

The previous prime is 76639463. The next prime is 76639523. The reversal of 76639481 is 18493667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47045881 + 29593600 = 6859^2 + 5440^2 .

It is a cyclic number.

It is not a de Polignac number, because 76639481 - 2¹⁸ = 76377337 is a prime.

It is a super-2 number, since 2×76639481² = 11747220095898722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (76639411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38319740 + 38319741.

It is an arithmetic number, because the mean of its divisors is an integer number (38319741).

Almost surely, 2^76639481 is an apocalyptic number.

It is an amenable number.

76639481 is a deficient number, since it is larger than the sum of its proper divisors (1).

76639481 is an equidigital number, since it uses as much as digits as its factorization.

76639481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 76639481 is about 8754.3978091014. The cubic root of 76639481 is about 424.7670806774.

The spelling of 76639481 in words is "seventy-six million, six hundred thirty-nine thousand, four hundred eighty-one".