87686451 has 12 divisors (see below), whose sum is σ = 128549512. Its totient is φ = 57584736.

The previous prime is 87686447. The next prime is 87686453. The reversal of 87686451 is 15468678.

It is a happy number.

It is not a de Polignac number, because 87686451 - 2² = 87686447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87686397 and 87686406.

It is not an unprimeable number, because it can be changed into a prime (87686453) 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 11 ways as a sum of consecutive naturals, for example, 72106 + ... + 73311.

Almost surely, 2^87686451 is an apocalyptic number.

87686451 is a deficient number, since it is larger than the sum of its proper divisors (40863061).

87686451 is a wasteful number, since it uses less digits than its factorization.

87686451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145490 (or 145487 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 87686451 is about 9364.1043885681. The cubic root of 87686451 is about 444.2671116126.

The spelling of 87686451 in words is "eighty-seven million, six hundred eighty-six thousand, four hundred fifty-one".