6420776 has 8 divisors (see below), whose sum is σ = 12038970. Its totient is φ = 3210384.

The previous prime is 6420769. The next prime is 6420787. The reversal of 6420776 is 6770246.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5152900 + 1267876 = 2270^2 + 1126^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 401291 + ... + 401306.

Almost surely, 2^6420776 is an apocalyptic number.

It is an amenable number.

6420776 is a deficient number, since it is larger than the sum of its proper divisors (5618194).

6420776 is a wasteful number, since it uses less digits than its factorization.

6420776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802603 (or 802599 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 6420776 is about 2533.9250186223. The cubic root of 6420776 is about 185.8642397782.

The spelling of 6420776 in words is "six million, four hundred twenty thousand, seven hundred seventy-six".