87653221 has 8 divisors (see below), whose sum is σ = 89853984. Its totient is φ = 85459920.

The previous prime is 87653183. The next prime is 87653239. The reversal of 87653221 is 12235678.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87653221 - 2¹⁹ = 87128933 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87653281) 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, 27606 + ... + 30616.

It is an arithmetic number, because the mean of its divisors is an integer number (11231748).

Almost surely, 2^87653221 is an apocalyptic number.

It is an amenable number.

87653221 is a deficient number, since it is larger than the sum of its proper divisors (2200763).

87653221 is a wasteful number, since it uses less digits than its factorization.

87653221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3731.

The product of its digits is 20160, while the sum is 34.

The square root of 87653221 is about 9362.3298916456. The cubic root of 87653221 is about 444.2109841219.

Adding to 87653221 its reverse (12235678), we get a palindrome (99888899).

The spelling of 87653221 in words is "eighty-seven million, six hundred fifty-three thousand, two hundred twenty-one".