87656505 has 32 divisors (see below), whose sum is σ = 149433984. Its totient is φ = 43723776.

The previous prime is 87656497. The next prime is 87656509. The reversal of 87656505 is 50565678.

It is not a de Polignac number, because 87656505 - 2³ = 87656497 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (87656509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43122 + ... + 45108.

It is an arithmetic number, because the mean of its divisors is an integer number (4669812).

Almost surely, 2^87656505 is an apocalyptic number.

87656505 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

87656505 is a deficient number, since it is larger than the sum of its proper divisors (61777479).

87656505 is a wasteful number, since it uses less digits than its factorization.

87656505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2185.

The product of its (nonzero) digits is 252000, while the sum is 42.

The square root of 87656505 is about 9362.5052736968. The cubic root of 87656505 is about 444.2165316292.

The spelling of 87656505 in words is "eighty-seven million, six hundred fifty-six thousand, five hundred five".