76761821 has 2 divisors, whose sum is σ = 76761822. Its totient is φ = 76761820.

The previous prime is 76761793. The next prime is 76761829. The reversal of 76761821 is 12816767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57304900 + 19456921 = 7570^2 + 4411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76761821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76761829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38380910 + 38380911.

It is an arithmetic number, because the mean of its divisors is an integer number (38380911).

Almost surely, 2^76761821 is an apocalyptic number.

It is an amenable number.

76761821 is a deficient number, since it is larger than the sum of its proper divisors (1).

76761821 is an equidigital number, since it uses as much as digits as its factorization.

76761821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 76761821 is about 8761.3823680969. The cubic root of 76761821 is about 424.9929798148.

The spelling of 76761821 in words is "seventy-six million, seven hundred sixty-one thousand, eight hundred twenty-one".