649600000 has 264 divisors, whose sum is σ = 1918939680. Its totient is φ = 215040000.

The previous prime is 649599989. The next prime is 649600013. The reversal of 649600000 is 6946.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22399986 + ... + 22400014.

Almost surely, 2^649600000 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 649600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (959469840).

649600000 is an abundant number, since it is smaller than the sum of its proper divisors (1269339680).

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

649600000 is an frugal number, since it uses more digits than its factorization.

649600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 649600000 is about 25487.2517153184. The cubic root of 649600000 is about 866.0613788063.

Adding to 649600000 its reverse (6946), we get a palindrome (649606946).

The spelling of 649600000 in words is "six hundred forty-nine million, six hundred thousand".