649281248 has 96 divisors (see below), whose sum is σ = 1632814848. Its totient is φ = 246758400.

The previous prime is 649281247. The next prime is 649281251. The reversal of 649281248 is 842182946.

It is a super-2 number, since 2×649281248² = 843132278008875008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 649281199 and 649281208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649281247) 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, 97811 + ... + 104237.

It is an arithmetic number, because the mean of its divisors is an integer number (17008488).

Almost surely, 2^649281248 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649281248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (816407424).

649281248 is an abundant number, since it is smaller than the sum of its proper divisors (983533600).

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

649281248 is a wasteful number, since it uses less digits than its factorization.

649281248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6496 (or 6488 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The square root of 649281248 is about 25480.9977826615. The cubic root of 649281248 is about 865.9196998439.

The spelling of 649281248 in words is "six hundred forty-nine million, two hundred eighty-one thousand, two hundred forty-eight".