736668643 has 4 divisors (see below), whose sum is σ = 762071040. Its totient is φ = 711266248.

The previous prime is 736668641. The next prime is 736668661. The reversal of 736668643 is 346866637.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346866637 = 13 ⋅26682049.

It is a cyclic number.

It is not a de Polignac number, because 736668643 - 2¹ = 736668641 is a prime.

It is a super-2 number, since 2×736668643² = 1085361379158922898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (736668641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12701155 + ... + 12701212.

It is an arithmetic number, because the mean of its divisors is an integer number (190517760).

Almost surely, 2^736668643 is an apocalyptic number.

736668643 is a deficient number, since it is larger than the sum of its proper divisors (25402397).

736668643 is a wasteful number, since it uses less digits than its factorization.

736668643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25402396.

The product of its digits is 2612736, while the sum is 49.

The square root of 736668643 is about 27141.6403888932. The cubic root of 736668643 is about 903.1448186054.

The spelling of 736668643 in words is "seven hundred thirty-six million, six hundred sixty-eight thousand, six hundred forty-three".