87817435402 has 4 divisors (see below), whose sum is σ = 131726153106. Its totient is φ = 43908717700.

The previous prime is 87817435399. The next prime is 87817435403. The reversal of 87817435402 is 20453471878.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 87563319921 + 254115481 = 295911^2 + 15941^2 .

It is a super-3 number, since 3×87817435402³ (a number of 34 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (87817435403) 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 as a sum of consecutive naturals, namely, 21954358849 + ... + 21954358852.

Almost surely, 2^87817435402 is an apocalyptic number.

87817435402 is a deficient number, since it is larger than the sum of its proper divisors (43908717704).

87817435402 is a wasteful number, since it uses less digits than its factorization.

87817435402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43908717703.

The product of its (nonzero) digits is 1505280, while the sum is 49.

The spelling of 87817435402 in words is "eighty-seven billion, eight hundred seventeen million, four hundred thirty-five thousand, four hundred two".