76740821 has 2 divisors, whose sum is σ = 76740822. Its totient is φ = 76740820.

The previous prime is 76740787. The next prime is 76740863. The reversal of 76740821 is 12804767.

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., 66748900 + 9991921 = 8170^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 76740821 - 2¹⁰ = 76739797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76742821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38370410 + 38370411.

It is an arithmetic number, because the mean of its divisors is an integer number (38370411).

Almost surely, 2^76740821 is an apocalyptic number.

It is an amenable number.

76740821 is a deficient number, since it is larger than the sum of its proper divisors (1).

76740821 is an equidigital number, since it uses as much as digits as its factorization.

76740821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 76740821 is about 8760.1838451028. The cubic root of 76740821 is about 424.9542206745.

The spelling of 76740821 in words is "seventy-six million, seven hundred forty thousand, eight hundred twenty-one".