87639117 has 8 divisors (see below), whose sum is σ = 119569824. Its totient is φ = 57067248.

The previous prime is 87639113. The next prime is 87639121. The reversal of 87639117 is 71193678.

It is an interprime number because it is at equal distance from previous prime (87639113) and next prime (87639121).

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

It is not a de Polignac number, because 87639117 - 2² = 87639113 is a prime.

It is a super-2 number, since 2×87639117² = 15361229657079378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87639113) 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, 339558 + ... + 339815.

It is an arithmetic number, because the mean of its divisors is an integer number (14946228).

Almost surely, 2^87639117 is an apocalyptic number.

It is an amenable number.

87639117 is a deficient number, since it is larger than the sum of its proper divisors (31930707).

87639117 is a wasteful number, since it uses less digits than its factorization.

87639117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679419.

The product of its digits is 63504, while the sum is 42.

The square root of 87639117 is about 9361.5766300341. The cubic root of 87639117 is about 444.1871573200.

It can be divided in two parts, 876 and 39117, that added together give a palindrome (39993).

The spelling of 87639117 in words is "eighty-seven million, six hundred thirty-nine thousand, one hundred seventeen".