766538643 has 32 divisors (see below), whose sum is σ = 1175408640. Its totient is φ = 440737920.

The previous prime is 766538609. The next prime is 766538671. The reversal of 766538643 is 346835667.

It is a happy number.

It is not a de Polignac number, because 766538643 - 2⁶ = 766538579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 766538592 and 766538601.

It is not an unprimeable number, because it can be changed into a prime (766538693) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24130 + ... + 45992.

It is an arithmetic number, because the mean of its divisors is an integer number (36731520).

Almost surely, 2^766538643 is an apocalyptic number.

766538643 is a deficient number, since it is larger than the sum of its proper divisors (408869997).

766538643 is a wasteful number, since it uses less digits than its factorization.

766538643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21939.

The product of its digits is 2177280, while the sum is 48.

The square root of 766538643 is about 27686.4342774580. The cubic root of 766538643 is about 915.1901793470.

The spelling of 766538643 in words is "seven hundred sixty-six million, five hundred thirty-eight thousand, six hundred forty-three".