649000000 has 196 divisors, whose sum is σ = 1785914640. Its totient is φ = 232000000.

The previous prime is 648999977. The next prime is 649000021. The reversal of 649000000 is 946.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 10999971 + ... + 11000029.

Almost surely, 2^649000000 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 649000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892957320).

649000000 is an abundant number, since it is smaller than the sum of its proper divisors (1136914640).

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

649000000 is an frugal number, since it uses more digits than its factorization.

649000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 649000000 is about 25475.4784057140. The cubic root of 649000000 is about 865.7946521560.

Adding to 649000000 its reverse (946), we get a palindrome (649000946).

It can be divided in two parts, 64 and 9000000, that multiplied together give a square (576000000 = 24000²).

The spelling of 649000000 in words is "six hundred forty-nine million", and thus it is an aban number.