649842336 has 288 divisors, whose sum is σ = 2245501440. Its totient is φ = 175564800.

The previous prime is 649842329. The next prime is 649842337. The reversal of 649842336 is 633248946.

It is a tau number, because it is divible by the number of its divisors (288).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 649842291 and 649842300.

It is not an unprimeable number, because it can be changed into a prime (649842337) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1276450 + ... + 1276958.

It is an arithmetic number, because the mean of its divisors is an integer number (7796880).

Almost surely, 2^649842336 is an apocalyptic number.

649842336 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649842336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1122750720).

649842336 is an abundant number, since it is smaller than the sum of its proper divisors (1595659104).

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

649842336 is a wasteful number, since it uses less digits than its factorization.

649842336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 569 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 649842336 is about 25492.0053350065. The cubic root of 649842336 is about 866.1690613582.

The spelling of 649842336 in words is "six hundred forty-nine million, eight hundred forty-two thousand, three hundred thirty-six".