87881601 has 4 divisors (see below), whose sum is σ = 117175472.
Its totient is φ = 58587732.
The previous prime is 87881581. The next prime is 87881603. The reversal of 87881601 is 10618878.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is not a de Polignac number, because 87881601 - 219 = 87357313 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 87881601.
It is not an unprimeable number, because it can be changed into a prime (87881603) 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, 14646931 + ... + 14646936.
It is an arithmetic number, because the mean of its divisors is an integer number (29293868).
Almost surely, 287881601 is an apocalyptic number.
It is an amenable number.
87881601 is a deficient number, since it is larger than the sum of its proper divisors (29293871).
87881601 is a wasteful number, since it uses less digits than its factorization.
87881601 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 29293870.
The product of its (nonzero) digits is 21504, while the sum is 39.
The square root of 87881601 is about 9374.5187076457.
The cubic root of 87881601 is about 444.5964459928.
The spelling of 87881601 in words is "eighty-seven million, eight hundred eighty-one thousand, six hundred one".