77489773 has 2 divisors, whose sum is σ = 77489774. Its totient is φ = 77489772.

The previous prime is 77489761. The next prime is 77489807. The reversal of 77489773 is 37798477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70509609 + 6980164 = 8397^2 + 2642^2 .

It is an emirp because it is prime and its reverse (37798477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77489773 - 2⁹ = 77489261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77489773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77489743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38744886 + 38744887.

It is an arithmetic number, because the mean of its divisors is an integer number (38744887).

Almost surely, 2^77489773 is an apocalyptic number.

It is an amenable number.

77489773 is a deficient number, since it is larger than the sum of its proper divisors (1).

77489773 is an equidigital number, since it uses as much as digits as its factorization.

77489773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2074464, while the sum is 52.

The square root of 77489773 is about 8802.8275570978. The cubic root of 77489773 is about 426.3321943986.

The spelling of 77489773 in words is "seventy-seven million, four hundred eighty-nine thousand, seven hundred seventy-three".