87782813 has 4 divisors (see below), whose sum is σ = 87841248. Its totient is φ = 87724380.

The previous prime is 87782791. The next prime is 87782819. The reversal of 87782813 is 31828778.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87782813 - 2⁶ = 87782749 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 (87782819) 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, 26903 + ... + 29988.

It is an arithmetic number, because the mean of its divisors is an integer number (21960312).

Almost surely, 2^87782813 is an apocalyptic number.

It is an amenable number.

87782813 is a deficient number, since it is larger than the sum of its proper divisors (58435).

87782813 is a wasteful number, since it uses less digits than its factorization.

87782813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58434.

The product of its digits is 150528, while the sum is 44.

The square root of 87782813 is about 9369.2482622674. The cubic root of 87782813 is about 444.4297927508.

The spelling of 87782813 in words is "eighty-seven million, seven hundred eighty-two thousand, eight hundred thirteen".