643755414 has 16 divisors (see below), whose sum is σ = 1287761328. Its totient is φ = 214543392.

The previous prime is 643755407. The next prime is 643755419. The reversal of 643755414 is 414557346.

It is a happy number.

It is a super-2 number, since 2×643755414² = 828842066108622792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643755419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49084 + ... + 60800.

It is an arithmetic number, because the mean of its divisors is an integer number (80485083).

Almost surely, 2^643755414 is an apocalyptic number.

643755414 is an abundant number, since it is smaller than the sum of its proper divisors (644005914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643755414 is a wasteful number, since it uses less digits than its factorization.

643755414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20879.

The product of its digits is 201600, while the sum is 39.

The square root of 643755414 is about 25372.3356039605. The cubic root of 643755414 is about 863.4561719373.

The spelling of 643755414 in words is "six hundred forty-three million, seven hundred fifty-five thousand, four hundred fourteen".