77008997 has 8 divisors (see below), whose sum is σ = 87811416. Its totient is φ = 66903552.

The previous prime is 77008993. The next prime is 77009003. The reversal of 77008997 is 79980077.

It can be written as a sum of positive squares in 4 ways, for example, as 25921 + 76983076 = 161^2 + 8774^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77008997 - 2² = 77008993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77008993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174008 + ... + 174449.

It is an arithmetic number, because the mean of its divisors is an integer number (10976427).

Almost surely, 2^77008997 is an apocalyptic number.

It is an amenable number.

77008997 is a deficient number, since it is larger than the sum of its proper divisors (10802419).

77008997 is a wasteful number, since it uses less digits than its factorization.

77008997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348487.

The product of its (nonzero) digits is 222264, while the sum is 47.

The square root of 77008997 is about 8775.4770240711. The cubic root of 77008997 is about 425.4486556172.

The spelling of 77008997 in words is "seventy-seven million, eight thousand, nine hundred ninety-seven".