77620229 has 2 divisors, whose sum is σ = 77620230. Its totient is φ = 77620228.

The previous prime is 77620201. The next prime is 77620271. The reversal of 77620229 is 92202677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43864129 + 33756100 = 6623^2 + 5810^2 .

It is a cyclic number.

It is not a de Polignac number, because 77620229 - 2⁸ = 77619973 is a prime.

It is a Chen prime.

It is equal to p_4538663 and since 77620229 and 4538663 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77620129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38810114 + 38810115.

It is an arithmetic number, because the mean of its divisors is an integer number (38810115).

Almost surely, 2^77620229 is an apocalyptic number.

It is an amenable number.

77620229 is a deficient number, since it is larger than the sum of its proper divisors (1).

77620229 is an equidigital number, since it uses as much as digits as its factorization.

77620229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 77620229 is about 8810.2343328654. The cubic root of 77620229 is about 426.5713072886.

The spelling of 77620229 in words is "seventy-seven million, six hundred twenty thousand, two hundred twenty-nine".