87015641 has 4 divisors (see below), whose sum is σ = 87877284. Its totient is φ = 86154000.

The previous prime is 87015637. The next prime is 87015679. The reversal of 87015641 is 14651078.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75759616 + 11256025 = 8704^2 + 3355^2 .

It is a cyclic number.

It is not a de Polignac number, because 87015641 - 2² = 87015637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 87015598 and 87015607.

It is not an unprimeable number, because it can be changed into a prime (87045641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430670 + ... + 430871.

It is an arithmetic number, because the mean of its divisors is an integer number (21969321).

Almost surely, 2^87015641 is an apocalyptic number.

It is an amenable number.

87015641 is a deficient number, since it is larger than the sum of its proper divisors (861643).

87015641 is a wasteful number, since it uses less digits than its factorization.

87015641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861642.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 87015641 is about 9328.2174610158. The cubic root of 87015641 is about 443.1313146073.

The spelling of 87015641 in words is "eighty-seven million, fifteen thousand, six hundred forty-one".