646077 has 4 divisors (see below), whose sum is σ = 861440. Its totient is φ = 430716.

The previous prime is 646073. The next prime is 646099. The reversal of 646077 is 770646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 646077 - 2² = 646073 is a prime.

It is a D-number.

It is a Duffinian number.

646077 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107677 + ... + 107682.

It is an arithmetic number, because the mean of its divisors is an integer number (215360).

2⁶⁴⁶⁰⁷⁷ is an apocalyptic number.

It is an amenable number.

646077 is a deficient number, since it is larger than the sum of its proper divisors (215363).

646077 is a wasteful number, since it uses less digits than its factorization.

646077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215362.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 646077 is about 803.7891514570. The cubic root of 646077 is about 86.4492892202.

The spelling of 646077 in words is "six hundred forty-six thousand, seventy-seven".