87642361 has 4 divisors (see below), whose sum is σ = 92797812. Its totient is φ = 82486912.

The previous prime is 87642343. The next prime is 87642371. The reversal of 87642361 is 16324678.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16324678 = 2 ⋅8162339.

It can be written as a sum of positive squares in 2 ways, for example, as 69622336 + 18020025 = 8344^2 + 4245^2 .

It is a cyclic number.

It is not a de Polignac number, because 87642361 - 2¹⁵ = 87609593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87642361.

It is not an unprimeable number, because it can be changed into a prime (87642341) 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, 2577700 + ... + 2577733.

It is an arithmetic number, because the mean of its divisors is an integer number (23199453).

Almost surely, 2^87642361 is an apocalyptic number.

It is an amenable number.

87642361 is a deficient number, since it is larger than the sum of its proper divisors (5155451).

87642361 is a wasteful number, since it uses less digits than its factorization.

87642361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155450.

The product of its digits is 48384, while the sum is 37.

The square root of 87642361 is about 9361.7498898443. The cubic root of 87642361 is about 444.1926378460.

The spelling of 87642361 in words is "eighty-seven million, six hundred forty-two thousand, three hundred sixty-one".