643677041 has 16 divisors (see below), whose sum is σ = 781219200. Its totient is φ = 518047488.

The previous prime is 643677037. The next prime is 643677061. The reversal of 643677041 is 140776346.

It is not a de Polignac number, because 643677041 - 2² = 643677037 is a prime.

It is a super-2 number, since 2×643677041² = 828640266221031362, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643676986 and 643677004.

It is not an unprimeable number, because it can be changed into a prime (643677031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6386 + ... + 36443.

It is an arithmetic number, because the mean of its divisors is an integer number (48826200).

Almost surely, 2^643677041 is an apocalyptic number.

It is an amenable number.

643677041 is a deficient number, since it is larger than the sum of its proper divisors (137542159).

643677041 is a wasteful number, since it uses less digits than its factorization.

643677041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42968.

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 643677041 is about 25370.7910992149. The cubic root of 643677041 is about 863.4211304731.

The spelling of 643677041 in words is "six hundred forty-three million, six hundred seventy-seven thousand, forty-one".