87856509806349 has 4 divisors (see below), whose sum is σ = 117142013075136. Its totient is φ = 58571006537564.

The previous prime is 87856509806297. The next prime is 87856509806371. The reversal of 87856509806349 is 94360890565878.

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 87856509806349 - 2⁴⁵ = 52672137717517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87856509846349) 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, 14642751634389 + ... + 14642751634394.

It is an arithmetic number, because the mean of its divisors is an integer number (29285503268784).

Almost surely, 2^{87856509806349} is an apocalyptic number.

It is an amenable number.

87856509806349 is a deficient number, since it is larger than the sum of its proper divisors (29285503268787).

87856509806349 is a wasteful number, since it uses less digits than its factorization.

87856509806349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29285503268786.

The product of its (nonzero) digits is 3135283200, while the sum is 78.

The spelling of 87856509806349 in words is "eighty-seven trillion, eight hundred fifty-six billion, five hundred nine million, eight hundred six thousand, three hundred forty-nine".