87257871401 has 4 divisors (see below), whose sum is σ = 87258669012. Its totient is φ = 87257073792.

The previous prime is 87257871391. The next prime is 87257871403. The reversal of 87257871401 is 10417875278.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17429280400 + 69828591001 = 132020^2 + 264251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87257871401 is a prime.

It is a super-2 number, since 2×87257871401² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87257871401.

It is not an unprimeable number, because it can be changed into a prime (87257871403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202496 + ... + 464241.

It is an arithmetic number, because the mean of its divisors is an integer number (21814667253).

Almost surely, 2^87257871401 is an apocalyptic number.

It is an amenable number.

87257871401 is a deficient number, since it is larger than the sum of its proper divisors (797611).

87257871401 is a wasteful number, since it uses less digits than its factorization.

87257871401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797610.

The product of its (nonzero) digits is 878080, while the sum is 50.

The spelling of 87257871401 in words is "eighty-seven billion, two hundred fifty-seven million, eight hundred seventy-one thousand, four hundred one".