76677721 has 2 divisors, whose sum is σ = 76677722. Its totient is φ = 76677720.

The previous prime is 76677709. The next prime is 76677751. The reversal of 76677721 is 12777667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45373696 + 31304025 = 6736^2 + 5595^2 .

It is a cyclic number.

It is not a de Polignac number, because 76677721 - 2⁷ = 76677593 is a prime.

It is not a weakly prime, because it can be changed into another prime (76677751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38338860 + 38338861.

It is an arithmetic number, because the mean of its divisors is an integer number (38338861).

Almost surely, 2^76677721 is an apocalyptic number.

It is an amenable number.

76677721 is a deficient number, since it is larger than the sum of its proper divisors (1).

76677721 is an equidigital number, since it uses as much as digits as its factorization.

76677721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172872, while the sum is 43.

The square root of 76677721 is about 8756.5815818731. The cubic root of 76677721 is about 424.8377161260.

It can be divided in two parts, 766 and 77721, that added together give a palindrome (78487).

The spelling of 76677721 in words is "seventy-six million, six hundred seventy-seven thousand, seven hundred twenty-one".