87056298781 has 4 divisors (see below), whose sum is σ = 88355646592. Its totient is φ = 85756950972.

The previous prime is 87056298761. The next prime is 87056298799. The reversal of 87056298781 is 18789265078.

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 87056298781 - 2²⁵ = 87022744349 is a prime.

It is a super-2 number, since 2×87056298781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87056298751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649673805 + ... + 649673938.

It is an arithmetic number, because the mean of its divisors is an integer number (22088911648).

Almost surely, 2^87056298781 is an apocalyptic number.

It is an amenable number.

87056298781 is a deficient number, since it is larger than the sum of its proper divisors (1299347811).

87056298781 is a wasteful number, since it uses less digits than its factorization.

87056298781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299347810.

The product of its (nonzero) digits is 13547520, while the sum is 61.

The spelling of 87056298781 in words is "eighty-seven billion, fifty-six million, two hundred ninety-eight thousand, seven hundred eighty-one".