77320087 has 4 divisors (see below), whose sum is σ = 83267800. Its totient is φ = 71372376.

The previous prime is 77320073. The next prime is 77320109. The reversal of 77320087 is 78002377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78002377 = 41 ⋅1902497.

It is a cyclic number.

It is not a de Polignac number, because 77320087 - 2¹¹ = 77318039 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 (77320387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2973837 + ... + 2973862.

It is an arithmetic number, because the mean of its divisors is an integer number (20816950).

Almost surely, 2^77320087 is an apocalyptic number.

77320087 is a deficient number, since it is larger than the sum of its proper divisors (5947713).

77320087 is a wasteful number, since it uses less digits than its factorization.

77320087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5947712.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 77320087 is about 8793.1841218071. The cubic root of 77320087 is about 426.0207749205.

The spelling of 77320087 in words is "seventy-seven million, three hundred twenty thousand, eighty-seven".