648349779 has 64 divisors (see below), whose sum is σ = 1143078912. Its totient is φ = 317001600.

The previous prime is 648349759. The next prime is 648349789. The reversal of 648349779 is 977943846.

It is not a de Polignac number, because 648349779 - 2⁷ = 648349651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (648349729) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 263734 + ... + 266180.

It is an arithmetic number, because the mean of its divisors is an integer number (17860608).

Almost surely, 2^648349779 is an apocalyptic number.

648349779 is a deficient number, since it is larger than the sum of its proper divisors (494729133).

648349779 is a wasteful number, since it uses less digits than its factorization.

648349779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536.

The product of its digits is 9144576, while the sum is 57.

The square root of 648349779 is about 25462.7135042595. The cubic root of 648349779 is about 865.5054143671.

The spelling of 648349779 in words is "six hundred forty-eight million, three hundred forty-nine thousand, seven hundred seventy-nine".