87951665 has 16 divisors (see below), whose sum is σ = 111472320. Its totient is φ = 66432960.

The previous prime is 87951653. The next prime is 87951667. The reversal of 87951665 is 56615978.

It is not a de Polignac number, because 87951665 - 2⁴ = 87951649 is a prime.

It is a Smith number, since the sum of its digits (47) 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 (87951667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30047 + ... + 32843.

It is an arithmetic number, because the mean of its divisors is an integer number (6967020).

Almost surely, 2^87951665 is an apocalyptic number.

It is an amenable number.

87951665 is a deficient number, since it is larger than the sum of its proper divisors (23520655).

87951665 is a wasteful number, since it uses less digits than its factorization.

87951665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152.

The product of its digits is 453600, while the sum is 47.

The square root of 87951665 is about 9378.2549016328. The cubic root of 87951665 is about 444.7145667769.

The spelling of 87951665 in words is "eighty-seven million, nine hundred fifty-one thousand, six hundred sixty-five".