87719645 has 8 divisors (see below), whose sum is σ = 113360856. Its totient is φ = 64777536.

The previous prime is 87719587. The next prime is 87719651. The reversal of 87719645 is 54691778.

It can be written as a sum of positive squares in 4 ways, for example, as 9467929 + 78251716 = 3077^2 + 8846^2 .

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 87719645 - 2⁶ = 87719581 is a prime.

It is a super-2 number, since 2×87719645² = 15389472237852050, 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 87719645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 674702 + ... + 674831.

It is an arithmetic number, because the mean of its divisors is an integer number (14170107).

Almost surely, 2^87719645 is an apocalyptic number.

It is an amenable number.

87719645 is a deficient number, since it is larger than the sum of its proper divisors (25641211).

87719645 is a wasteful number, since it uses less digits than its factorization.

87719645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349551.

The product of its digits is 423360, while the sum is 47.

The square root of 87719645 is about 9365.8766274172. The cubic root of 87719645 is about 444.3231641418.

The spelling of 87719645 in words is "eighty-seven million, seven hundred nineteen thousand, six hundred forty-five".