649678345 has 8 divisors (see below), whose sum is σ = 781706376. Its totient is φ = 518347776.

The previous prime is 649678303. The next prime is 649678349. The reversal of 649678345 is 543876946.

It can be written as a sum of positive squares in 4 ways, for example, as 194965369 + 454712976 = 13963^2 + 21324^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 649678345 - 2¹⁷ = 649547273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649678292 and 649678301.

It is not an unprimeable number, because it can be changed into a prime (649678349) 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, 172312 + ... + 176041.

It is an arithmetic number, because the mean of its divisors is an integer number (97713297).

Almost surely, 2^649678345 is an apocalyptic number.

It is an amenable number.

649678345 is a deficient number, since it is larger than the sum of its proper divisors (132028031).

649678345 is a wasteful number, since it uses less digits than its factorization.

649678345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348731.

The product of its digits is 4354560, while the sum is 52.

The square root of 649678345 is about 25488.7886138200. The cubic root of 649678345 is about 866.0961945140.

The spelling of 649678345 in words is "six hundred forty-nine million, six hundred seventy-eight thousand, three hundred forty-five".