77306489 has 24 divisors (see below), whose sum is σ = 88982040. Its totient is φ = 66673152.

The previous prime is 77306447. The next prime is 77306491. The reversal of 77306489 is 98460377.

It can be written as a sum of positive squares in 12 ways, for example, as 7333264 + 69973225 = 2708^2 + 8365^2 .

It is a de Polignac number, because none of the positive numbers 2^k-77306489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77306419) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1058957 + ... + 1059029.

It is an arithmetic number, because the mean of its divisors is an integer number (3707585).

Almost surely, 2^77306489 is an apocalyptic number.

It is an amenable number.

77306489 is a deficient number, since it is larger than the sum of its proper divisors (11675551).

77306489 is a wasteful number, since it uses less digits than its factorization.

77306489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 77306489 is about 8792.4108752947. The cubic root of 77306489 is about 425.9957992195.

The spelling of 77306489 in words is "seventy-seven million, three hundred six thousand, four hundred eighty-nine".