87856781357 has 4 divisors (see below), whose sum is σ = 91676641440. Its totient is φ = 84036921276.

The previous prime is 87856781329. The next prime is 87856781393. The reversal of 87856781357 is 75318765878.

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 87856781357 - 2¹⁴ = 87856764973 is a prime.

It is a super-2 number, since 2×87856781357² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87856781293 and 87856781302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87856781317) 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, 1909930007 + ... + 1909930052.

It is an arithmetic number, because the mean of its divisors is an integer number (22919160360).

Almost surely, 2^87856781357 is an apocalyptic number.

It is an amenable number.

87856781357 is a deficient number, since it is larger than the sum of its proper divisors (3819860083).

87856781357 is a wasteful number, since it uses less digits than its factorization.

87856781357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3819860082.

The product of its digits is 79027200, while the sum is 65.

The spelling of 87856781357 in words is "eighty-seven billion, eight hundred fifty-six million, seven hundred eighty-one thousand, three hundred fifty-seven".