87613857 has 6 divisors (see below), whose sum is σ = 126553362. Its totient is φ = 58409232.

The previous prime is 87613853. The next prime is 87613861. The reversal of 87613857 is 75831678.

It is an interprime number because it is at equal distance from previous prime (87613853) and next prime (87613861).

It can be written as a sum of positive squares in only one way, i.e., 67174416 + 20439441 = 8196^2 + 4521^2 .

It is not a de Polignac number, because 87613857 - 2² = 87613853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87613853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4867428 + ... + 4867445.

It is an arithmetic number, because the mean of its divisors is an integer number (21092227).

Almost surely, 2^87613857 is an apocalyptic number.

It is an amenable number.

87613857 is a deficient number, since it is larger than the sum of its proper divisors (38939505).

87613857 is a wasteful number, since it uses less digits than its factorization.

87613857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9734879 (or 9734876 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 87613857 is about 9360.2274010838. The cubic root of 87613857 is about 444.1444775741.

The spelling of 87613857 in words is "eighty-seven million, six hundred thirteen thousand, eight hundred fifty-seven".