87205501 has 4 divisors (see below), whose sum is σ = 87373404. Its totient is φ = 87037600.

The previous prime is 87205487. The next prime is 87205507. The reversal of 87205501 is 10550278.

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 65124900 + 22080601 = 8070^2 + 4699^2 .

It is a cyclic number.

It is not a de Polignac number, because 87205501 - 2⁷ = 87205373 is a prime.

It is a super-2 number, since 2×87205501² = 15209598809322002, which contains 22 as substring.

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 87205501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87205507) 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, 83170 + ... + 84211.

It is an arithmetic number, because the mean of its divisors is an integer number (21843351).

Almost surely, 2^87205501 is an apocalyptic number.

It is an amenable number.

87205501 is a deficient number, since it is larger than the sum of its proper divisors (167903).

87205501 is a wasteful number, since it uses less digits than its factorization.

87205501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167902.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 87205501 is about 9338.3885654860. The cubic root of 87205501 is about 443.4533708661.

Adding to 87205501 its reverse (10550278), we get a palindrome (97755779).

The spelling of 87205501 in words is "eighty-seven million, two hundred five thousand, five hundred one".