648458777 has 4 divisors (see below), whose sum is σ = 653408976. Its totient is φ = 643508580.

The previous prime is 648458719. The next prime is 648458819. The reversal of 648458777 is 777854846.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 648458777 - 2⁸ = 648458521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648458177) 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, 2474903 + ... + 2475164.

It is an arithmetic number, because the mean of its divisors is an integer number (163352244).

Almost surely, 2^648458777 is an apocalyptic number.

It is an amenable number.

648458777 is a deficient number, since it is larger than the sum of its proper divisors (4950199).

648458777 is a wasteful number, since it uses less digits than its factorization.

648458777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4950198.

The product of its digits is 10536960, while the sum is 56.

The square root of 648458777 is about 25464.8537596429. The cubic root of 648458777 is about 865.5539134315.

The spelling of 648458777 in words is "six hundred forty-eight million, four hundred fifty-eight thousand, seven hundred seventy-seven".