77480989 has 2 divisors, whose sum is σ = 77480990. Its totient is φ = 77480988.

The previous prime is 77480987. The next prime is 77481013. The reversal of 77480989 is 98908477.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71064900 + 6416089 = 8430^2 + 2533^2 .

It is a cyclic number.

It is not a de Polignac number, because 77480989 - 2¹ = 77480987 is a prime.

Together with 77480987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77480987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38740494 + 38740495.

It is an arithmetic number, because the mean of its divisors is an integer number (38740495).

Almost surely, 2^77480989 is an apocalyptic number.

It is an amenable number.

77480989 is a deficient number, since it is larger than the sum of its proper divisors (1).

77480989 is an equidigital number, since it uses as much as digits as its factorization.

77480989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 77480989 is about 8802.3286123616. The cubic root of 77480989 is about 426.3160845587.

The spelling of 77480989 in words is "seventy-seven million, four hundred eighty thousand, nine hundred eighty-nine".