649512880 has 80 divisors (see below), whose sum is σ = 1629297504. Its totient is φ = 239882240.

The previous prime is 649512841. The next prime is 649512917. The reversal of 649512880 is 88215946.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67575 + ... + 76585.

Almost surely, 2^649512880 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 649512880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (814648752).

649512880 is an abundant number, since it is smaller than the sum of its proper divisors (979784624).

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

649512880 is a wasteful number, since it uses less digits than its factorization.

649512880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9094 (or 9088 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 43.

The square root of 649512880 is about 25485.5425682876. The cubic root of 649512880 is about 866.0226602920.

The spelling of 649512880 in words is "six hundred forty-nine million, five hundred twelve thousand, eight hundred eighty".