87891619 has 8 divisors (see below), whose sum is σ = 88931520. Its totient is φ = 86855976.

The previous prime is 87891607. The next prime is 87891623. The reversal of 87891619 is 91619878.

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 87891619 - 2⁷ = 87891491 is a prime.

It is a super-2 number, since 2×87891619² = 15449873380882322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87891679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59512 + ... + 60970.

It is an arithmetic number, because the mean of its divisors is an integer number (11116440).

Almost surely, 2^87891619 is an apocalyptic number.

87891619 is a deficient number, since it is larger than the sum of its proper divisors (1039901).

87891619 is a wasteful number, since it uses less digits than its factorization.

87891619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129.

The product of its digits is 217728, while the sum is 49.

The square root of 87891619 is about 9375.0530131834. The cubic root of 87891619 is about 444.6133391685.

The spelling of 87891619 in words is "eighty-seven million, eight hundred ninety-one thousand, six hundred nineteen".