646744750 has 16 divisors (see below), whose sum is σ = 1210706640. Its totient is φ = 258697800.

The previous prime is 646744729. The next prime is 646744759. The reversal of 646744750 is 57447646.

It is a junction number, because it is equal to n+sod(n) for n = 646744697 and 646744706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646744759) 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, 1293240 + ... + 1293739.

It is an arithmetic number, because the mean of its divisors is an integer number (75669165).

Almost surely, 2^646744750 is an apocalyptic number.

646744750 is a deficient number, since it is larger than the sum of its proper divisors (563961890).

646744750 is a wasteful number, since it uses less digits than its factorization.

646744750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2586996 (or 2586986 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 43.

The square root of 646744750 is about 25431.1767325069. The cubic root of 646744750 is about 864.7906205776.

The spelling of 646744750 in words is "six hundred forty-six million, seven hundred forty-four thousand, seven hundred fifty".