87786121 has 4 divisors (see below), whose sum is σ = 88173072. Its totient is φ = 87399172.

The previous prime is 87786119. The next prime is 87786131. The reversal of 87786121 is 12168778.

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 87786121 - 2¹ = 87786119 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87786131) 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, 193135 + ... + 193588.

It is an arithmetic number, because the mean of its divisors is an integer number (22043268).

Almost surely, 2^87786121 is an apocalyptic number.

It is an amenable number.

87786121 is a deficient number, since it is larger than the sum of its proper divisors (386951).

87786121 is a wasteful number, since it uses less digits than its factorization.

87786121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386950.

The product of its digits is 37632, while the sum is 40.

The square root of 87786121 is about 9369.4247955784. The cubic root of 87786121 is about 444.4353752987.

The spelling of 87786121 in words is "eighty-seven million, seven hundred eighty-six thousand, one hundred twenty-one".