6620755 has 4 divisors (see below), whose sum is σ = 7944912. Its totient is φ = 5296600.

The previous prime is 6620741. The next prime is 6620771. The reversal of 6620755 is 5570266.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6620755 - 2¹³ = 6612563 is a prime.

It is a Duffinian number.

6620755 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662071 + ... + 662080.

It is an arithmetic number, because the mean of its divisors is an integer number (1986228).

Almost surely, 2^6620755 is an apocalyptic number.

6620755 is a deficient number, since it is larger than the sum of its proper divisors (1324157).

6620755 is a wasteful number, since it uses less digits than its factorization.

6620755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324156.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 6620755 is about 2573.0827814122. The cubic root of 6620755 is about 187.7741648433.

The spelling of 6620755 in words is "six million, six hundred twenty thousand, seven hundred fifty-five".