6615987 has 8 divisors (see below), whose sum is σ = 10081536. Its totient is φ = 3780552.

The previous prime is 6615979. The next prime is 6616003. The reversal of 6615987 is 7895166.

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

It is not a de Polignac number, because 6615987 - 2³ = 6615979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6615967) 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, 157503 + ... + 157544.

It is an arithmetic number, because the mean of its divisors is an integer number (1260192).

Almost surely, 2^6615987 is an apocalyptic number.

6615987 is a deficient number, since it is larger than the sum of its proper divisors (3465549).

6615987 is a wasteful number, since it uses less digits than its factorization.

6615987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315057.

The product of its digits is 90720, while the sum is 42.

The square root of 6615987 is about 2572.1560994621. The cubic root of 6615987 is about 187.7290782318.

The spelling of 6615987 in words is "six million, six hundred fifteen thousand, nine hundred eighty-seven".