77420071 has 2 divisors, whose sum is σ = 77420072. Its totient is φ = 77420070.

The previous prime is 77420059. The next prime is 77420137. The reversal of 77420071 is 17002477.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77420071 - 2⁵ = 77420039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77424071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38710035 + 38710036.

It is an arithmetic number, because the mean of its divisors is an integer number (38710036).

Almost surely, 2^77420071 is an apocalyptic number.

77420071 is a deficient number, since it is larger than the sum of its proper divisors (1).

77420071 is an equidigital number, since it uses as much as digits as its factorization.

77420071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 77420071 is about 8798.8675975946. The cubic root of 77420071 is about 426.2043275425.

The spelling of 77420071 in words is "seventy-seven million, four hundred twenty thousand, seventy-one".