6401777 has 4 divisors (see below), whose sum is σ = 6574836. Its totient is φ = 6228720.

The previous prime is 6401771. The next prime is 6401827. The reversal of 6401777 is 7771046.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4669921 + 1731856 = 2161^2 + 1316^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401777 - 2⁴ = 6401761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6401771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86474 + ... + 86547.

It is an arithmetic number, because the mean of its divisors is an integer number (1643709).

Almost surely, 2^6401777 is an apocalyptic number.

It is an amenable number.

6401777 is a deficient number, since it is larger than the sum of its proper divisors (173059).

6401777 is a wasteful number, since it uses less digits than its factorization.

6401777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173058.

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 6401777 is about 2530.1733142218. The cubic root of 6401777 is about 185.6807353030.

The spelling of 6401777 in words is "six million, four hundred one thousand, seven hundred seventy-seven".