648693378 has 24 divisors (see below), whose sum is σ = 1488179628. Its totient is φ = 203511552.

The previous prime is 648693347. The next prime is 648693379. The reversal of 648693378 is 873396846.

648693378 is a `hidden beast` number, since 6 + 486 + 93 + 3 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 627652809 + 21040569 = 25053^2 + 4587^2 .

It is a super-2 number, since 2×648693378² = 841606197322101768, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (648693379) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1059651 + ... + 1060262.

Almost surely, 2^648693378 is an apocalyptic number.

648693378 is an abundant number, since it is smaller than the sum of its proper divisors (839486250).

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

648693378 is a wasteful number, since it uses less digits than its factorization.

648693378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119938 (or 2119935 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 648693378 is about 25469.4597115840. The cubic root of 648693378 is about 865.6582815826.

The spelling of 648693378 in words is "six hundred forty-eight million, six hundred ninety-three thousand, three hundred seventy-eight".