87219643 has 4 divisors (see below), whose sum is σ = 99679600. Its totient is φ = 74759688.

The previous prime is 87219631. The next prime is 87219677. The reversal of 87219643 is 34691278.

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

It is a cyclic number.

It is not a de Polignac number, because 87219643 - 2⁹ = 87219131 is a prime.

It is a super-2 number, since 2×87219643² = 15214532250094898, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 87219596 and 87219605.

It is not an unprimeable number, because it can be changed into a prime (87219043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6229968 + ... + 6229981.

It is an arithmetic number, because the mean of its divisors is an integer number (24919900).

Almost surely, 2^87219643 is an apocalyptic number.

87219643 is a deficient number, since it is larger than the sum of its proper divisors (12459957).

87219643 is a wasteful number, since it uses less digits than its factorization.

87219643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12459956.

The product of its digits is 72576, while the sum is 40.

The square root of 87219643 is about 9339.1457318108. The cubic root of 87219643 is about 443.4773409847.

The spelling of 87219643 in words is "eighty-seven million, two hundred nineteen thousand, six hundred forty-three".