77484985 has 4 divisors (see below), whose sum is σ = 92981988. Its totient is φ = 61987984.

The previous prime is 77484977. The next prime is 77484989. The reversal of 77484985 is 58948477.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57198969 + 20286016 = 7563^2 + 4504^2 .

It is a cyclic number.

It is not a de Polignac number, because 77484985 - 2³ = 77484977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77484989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7748494 + ... + 7748503.

It is an arithmetic number, because the mean of its divisors is an integer number (23245497).

Almost surely, 2^77484985 is an apocalyptic number.

It is an amenable number.

77484985 is a deficient number, since it is larger than the sum of its proper divisors (15497003).

77484985 is a wasteful number, since it uses less digits than its factorization.

77484985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15497002.

The product of its digits is 2257920, while the sum is 52.

The square root of 77484985 is about 8802.5555948259. Note that the first 4 decimals coincide. The cubic root of 77484985 is about 426.3234133664.

The spelling of 77484985 in words is "seventy-seven million, four hundred eighty-four thousand, nine hundred eighty-five".