87736921 has 8 divisors (see below), whose sum is σ = 89800704. Its totient is φ = 85681440.

The previous prime is 87736907. The next prime is 87736931. The reversal of 87736921 is 12963778.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87736921 - 2⁹ = 87736409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87736931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22696 + ... + 26278.

It is an arithmetic number, because the mean of its divisors is an integer number (11225088).

Almost surely, 2^87736921 is an apocalyptic number.

It is an amenable number.

87736921 is a deficient number, since it is larger than the sum of its proper divisors (2063783).

87736921 is a wasteful number, since it uses less digits than its factorization.

87736921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151.

The product of its digits is 127008, while the sum is 43.

The square root of 87736921 is about 9366.7988662082. The cubic root of 87736921 is about 444.3523313943.

The spelling of 87736921 in words is "eighty-seven million, seven hundred thirty-six thousand, nine hundred twenty-one".