646383877 has 8 divisors (see below), whose sum is σ = 695627352. Its totient is φ = 598387200.

The previous prime is 646383863. The next prime is 646383893. The reversal of 646383877 is 778383646.

It can be written as a sum of positive squares in 4 ways, for example, as 1934881 + 644448996 = 1391^2 + 25386^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 646383877 - 2¹⁵ = 646351109 is a prime.

It is a super-2 number, since 2×646383877² = 835624232891102258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646383277) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 310624 + ... + 312697.

It is an arithmetic number, because the mean of its divisors is an integer number (86953419).

Almost surely, 2^646383877 is an apocalyptic number.

It is an amenable number.

646383877 is a deficient number, since it is larger than the sum of its proper divisors (49243475).

646383877 is a wasteful number, since it uses less digits than its factorization.

646383877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623399.

The product of its digits is 4064256, while the sum is 52.

The square root of 646383877 is about 25424.0806520118. The cubic root of 646383877 is about 864.6297443078.

The spelling of 646383877 in words is "six hundred forty-six million, three hundred eighty-three thousand, eight hundred seventy-seven".