87786613 has 4 divisors (see below), whose sum is σ = 87926368. Its totient is φ = 87646860.

The previous prime is 87786599. The next prime is 87786619. The reversal of 87786613 is 31668778.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31668778 = 2 ⋅15834389.

It is a cyclic number.

It is not a de Polignac number, because 87786613 - 2¹⁷ = 87655541 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 (87786619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68931 + ... + 70192.

It is an arithmetic number, because the mean of its divisors is an integer number (21981592).

Almost surely, 2^87786613 is an apocalyptic number.

It is an amenable number.

87786613 is a deficient number, since it is larger than the sum of its proper divisors (139755).

87786613 is a wasteful number, since it uses less digits than its factorization.

87786613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139754.

The product of its digits is 338688, while the sum is 46.

The square root of 87786613 is about 9369.4510511556. The cubic root of 87786613 is about 444.4362055811.

The spelling of 87786613 in words is "eighty-seven million, seven hundred eighty-six thousand, six hundred thirteen".