755720643 has 16 divisors (see below), whose sum is σ = 1029500576. Its totient is φ = 492963840.

The previous prime is 755720617. The next prime is 755720689. The reversal of 755720643 is 346027557.

It is not a de Polignac number, because 755720643 - 2²⁴ = 738943427 is a prime.

It is a super-2 number, since 2×755720643² = 1142227380512666898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (755790643) 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, 24621 + ... + 46017.

It is an arithmetic number, because the mean of its divisors is an integer number (64343786).

Almost surely, 2^755720643 is an apocalyptic number.

755720643 is a deficient number, since it is larger than the sum of its proper divisors (273779933).

755720643 is a wasteful number, since it uses less digits than its factorization.

755720643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21654.

The product of its (nonzero) digits is 176400, while the sum is 39.

The square root of 755720643 is about 27490.3736424225. The cubic root of 755720643 is about 910.8644697513.

The spelling of 755720643 in words is "seven hundred fifty-five million, seven hundred twenty thousand, six hundred forty-three".