77620061 has 2 divisors, whose sum is σ = 77620062. Its totient is φ = 77620060.

The previous prime is 77620057. The next prime is 77620069. The reversal of 77620061 is 16002677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69388900 + 8231161 = 8330^2 + 2869^2 .

It is an emirp because it is prime and its reverse (16002677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77620061 - 2² = 77620057 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 (77620069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38810030 + 38810031.

It is an arithmetic number, because the mean of its divisors is an integer number (38810031).

Almost surely, 2^77620061 is an apocalyptic number.

It is an amenable number.

77620061 is a deficient number, since it is larger than the sum of its proper divisors (1).

77620061 is an equidigital number, since it uses as much as digits as its factorization.

77620061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 77620061 is about 8810.2247984941. The cubic root of 77620061 is about 426.5709995337.

The spelling of 77620061 in words is "seventy-seven million, six hundred twenty thousand, sixty-one".