648893778 has 32 divisors (see below), whose sum is σ = 1401636096. Its totient is φ = 199085568.

The previous prime is 648893771. The next prime is 648893809. The reversal of 648893778 is 877398846.

648893778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×648893778² = 842126270254226568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (648893771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15751 + ... + 39317.

It is an arithmetic number, because the mean of its divisors is an integer number (43801128).

Almost surely, 2^648893778 is an apocalyptic number.

648893778 is an abundant number, since it is smaller than the sum of its proper divisors (752742318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648893778 is a wasteful number, since it uses less digits than its factorization.

648893778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23938.

The product of its digits is 16257024, while the sum is 60.

The square root of 648893778 is about 25473.3935312906. The cubic root of 648893778 is about 865.7474146329.

The spelling of 648893778 in words is "six hundred forty-eight million, eight hundred ninety-three thousand, seven hundred seventy-eight".