87219257 has 8 divisors (see below), whose sum is σ = 88627392. Its totient is φ = 85822000.

The previous prime is 87219247. The next prime is 87219271. The reversal of 87219257 is 75291278.

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 87219257 - 2⁴ = 87219241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87219217) 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, 14282 + ... + 19452.

It is an arithmetic number, because the mean of its divisors is an integer number (11078424).

Almost surely, 2^87219257 is an apocalyptic number.

It is an amenable number.

87219257 is a deficient number, since it is larger than the sum of its proper divisors (1408135).

87219257 is a wasteful number, since it uses less digits than its factorization.

87219257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5439.

The product of its digits is 70560, while the sum is 41.

The square root of 87219257 is about 9339.1250660862. The cubic root of 87219257 is about 443.4766867647.

The spelling of 87219257 in words is "eighty-seven million, two hundred nineteen thousand, two hundred fifty-seven".