87764791 has 4 divisors (see below), whose sum is σ = 87823000. Its totient is φ = 87706584.

The previous prime is 87764773. The next prime is 87764797. The reversal of 87764791 is 19746778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19746778 = 2 ⋅9873389.

It is a cyclic number.

It is not a de Polignac number, because 87764791 - 2⁹ = 87764279 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 (87764797) 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, 26781 + ... + 29878.

It is an arithmetic number, because the mean of its divisors is an integer number (21955750).

Almost surely, 2^87764791 is an apocalyptic number.

87764791 is a deficient number, since it is larger than the sum of its proper divisors (58209).

87764791 is a wasteful number, since it uses less digits than its factorization.

87764791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58208.

The product of its digits is 592704, while the sum is 49.

The square root of 87764791 is about 9368.2864495061. The cubic root of 87764791 is about 444.3993765389.

The spelling of 87764791 in words is "eighty-seven million, seven hundred sixty-four thousand, seven hundred ninety-one".