87642017 has 4 divisors (see below), whose sum is σ = 88008960. Its totient is φ = 87275076.

The previous prime is 87642001. The next prime is 87642067. The reversal of 87642017 is 71024678.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71024678 = 2 ⋅35512339.

It is a cyclic number.

It is not a de Polignac number, because 87642017 - 2⁴ = 87642001 is a prime.

It is a super-2 number, since 2×87642017² = 15362246287656578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87642067) 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, 183113 + ... + 183590.

It is an arithmetic number, because the mean of its divisors is an integer number (22002240).

Almost surely, 2^87642017 is an apocalyptic number.

It is an amenable number.

87642017 is a deficient number, since it is larger than the sum of its proper divisors (366943).

87642017 is a wasteful number, since it uses less digits than its factorization.

87642017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366942.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 87642017 is about 9361.7315171927. The cubic root of 87642017 is about 444.1920566869.

The spelling of 87642017 in words is "eighty-seven million, six hundred forty-two thousand, seventeen".