76408021 has 2 divisors, whose sum is σ = 76408022. Its totient is φ = 76408020.

The previous prime is 76407983. The next prime is 76408027. The reversal of 76408021 is 12080467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43758225 + 32649796 = 6615^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 76408021 - 2⁹ = 76407509 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 (76408027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38204010 + 38204011.

It is an arithmetic number, because the mean of its divisors is an integer number (38204011).

Almost surely, 2^76408021 is an apocalyptic number.

It is an amenable number.

76408021 is a deficient number, since it is larger than the sum of its proper divisors (1).

76408021 is an equidigital number, since it uses as much as digits as its factorization.

76408021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 76408021 is about 8741.1681713602. The cubic root of 76408021 is about 424.3390344129.

Adding to 76408021 its reverse (12080467), we get a palindrome (88488488).

The spelling of 76408021 in words is "seventy-six million, four hundred eight thousand, twenty-one".