6620787 has 12 divisors (see below), whose sum is σ = 9893520. Its totient is φ = 4261488.

The previous prime is 6620777. The next prime is 6620791. The reversal of 6620787 is 7870266.

It is not a de Polignac number, because 6620787 - 2⁴ = 6620771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6620717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12423 + ... + 12944.

It is an arithmetic number, because the mean of its divisors is an integer number (824460).

Almost surely, 2^6620787 is an apocalyptic number.

6620787 is a deficient number, since it is larger than the sum of its proper divisors (3272733).

6620787 is a wasteful number, since it uses less digits than its factorization.

6620787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25402 (or 25399 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 6620787 is about 2573.0889996267. The cubic root of 6620787 is about 187.7744673648.

The spelling of 6620787 in words is "six million, six hundred twenty thousand, seven hundred eighty-seven".