87919801 has 4 divisors (see below), whose sum is σ = 93091572. Its totient is φ = 82748032.

The previous prime is 87919789. The next prime is 87919829. The reversal of 87919801 is 10891978.

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 47610000 + 40309801 = 6900^2 + 6349^2 .

It is a cyclic number.

It is not a de Polignac number, because 87919801 - 2⁷ = 87919673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87919831) 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, 2585860 + ... + 2585893.

It is an arithmetic number, because the mean of its divisors is an integer number (23272893).

Almost surely, 2^87919801 is an apocalyptic number.

It is an amenable number.

87919801 is a deficient number, since it is larger than the sum of its proper divisors (5171771).

87919801 is a wasteful number, since it uses less digits than its factorization.

87919801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5171770.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 87919801 is about 9376.5559242187. Note that the first 3 decimals coincide. The cubic root of 87919801 is about 444.6608550912.

The spelling of 87919801 in words is "eighty-seven million, nine hundred nineteen thousand, eight hundred one".