6621445 has 8 divisors (see below), whose sum is σ = 8202240. Its totient is φ = 5126160.

The previous prime is 6621421. The next prime is 6621451. The reversal of 6621445 is 5441266.

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

It is not a de Polignac number, because 6621445 - 2⁵ = 6621413 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21205 + ... + 21514.

It is an arithmetic number, because the mean of its divisors is an integer number (1025280).

Almost surely, 2^6621445 is an apocalyptic number.

It is an amenable number.

6621445 is a deficient number, since it is larger than the sum of its proper divisors (1580795).

6621445 is a wasteful number, since it uses less digits than its factorization.

6621445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42755.

The product of its digits is 5760, while the sum is 28.

The square root of 6621445 is about 2573.2168583312. The cubic root of 6621445 is about 187.7806877485.

The spelling of 6621445 in words is "six million, six hundred twenty-one thousand, four hundred forty-five".