6620287 has 2 divisors, whose sum is σ = 6620288. Its totient is φ = 6620286.

The previous prime is 6620281. The next prime is 6620291. The reversal of 6620287 is 7820266.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6620287 - 2¹¹ = 6618239 is a prime.

It is a super-4 number, since 4×6620287⁴ (a number of 28 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6620281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3310143 + 3310144.

It is an arithmetic number, because the mean of its divisors is an integer number (3310144).

Almost surely, 2^6620287 is an apocalyptic number.

6620287 is a deficient number, since it is larger than the sum of its proper divisors (1).

6620287 is an equidigital number, since it uses as much as digits as its factorization.

6620287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 6620287 is about 2572.9918383081. The cubic root of 6620287 is about 187.7697403539.

The spelling of 6620287 in words is "six million, six hundred twenty thousand, two hundred eighty-seven".