649273739 has 4 divisors (see below), whose sum is σ = 677503056. Its totient is φ = 621044424.

The previous prime is 649273699. The next prime is 649273759. The reversal of 649273739 is 937372946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649273739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649273759) 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, 14114624 + ... + 14114669.

It is an arithmetic number, because the mean of its divisors is an integer number (169375764).

Almost surely, 2^649273739 is an apocalyptic number.

649273739 is a deficient number, since it is larger than the sum of its proper divisors (28229317).

649273739 is a wasteful number, since it uses less digits than its factorization.

649273739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28229316.

The product of its digits is 1714608, while the sum is 50.

The square root of 649273739 is about 25480.8504371420. The cubic root of 649273739 is about 865.9163616828.

The spelling of 649273739 in words is "six hundred forty-nine million, two hundred seventy-three thousand, seven hundred thirty-nine".