6620987 has 16 divisors (see below), whose sum is σ = 7392000. Its totient is φ = 5901984.

The previous prime is 6620981. The next prime is 6621029. The reversal of 6620987 is 7890266.

It is not a de Polignac number, because 6620987 - 2¹⁴ = 6604603 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 6620987.

It is not an unprimeable number, because it can be changed into a prime (6620981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47564 + ... + 47702.

It is an arithmetic number, because the mean of its divisors is an integer number (462000).

Almost surely, 2^6620987 is an apocalyptic number.

6620987 is a deficient number, since it is larger than the sum of its proper divisors (771013).

6620987 is a wasteful number, since it uses less digits than its factorization.

6620987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 6620987 is about 2573.1278631269. The cubic root of 6620987 is about 187.7763581026.

The spelling of 6620987 in words is "six million, six hundred twenty thousand, nine hundred eighty-seven".