77220791 has 2 divisors, whose sum is σ = 77220792. Its totient is φ = 77220790.

The previous prime is 77220757. The next prime is 77220811. The reversal of 77220791 is 19702277.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77220791 - 2¹⁰ = 77219767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77222791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38610395 + 38610396.

It is an arithmetic number, because the mean of its divisors is an integer number (38610396).

Almost surely, 2^77220791 is an apocalyptic number.

77220791 is a deficient number, since it is larger than the sum of its proper divisors (1).

77220791 is an equidigital number, since it uses as much as digits as its factorization.

77220791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 77220791 is about 8787.5361165687. The cubic root of 77220791 is about 425.8383286685.

The spelling of 77220791 in words is "seventy-seven million, two hundred twenty thousand, seven hundred ninety-one".