649690016 has 96 divisors (see below), whose sum is σ = 1406160000. Its totient is φ = 294497280.

The previous prime is 649689991. The next prime is 649690049. The reversal of 649690016 is 610096946.

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, 1301735 + ... + 1302233.

It is an arithmetic number, because the mean of its divisors is an integer number (14647500).

Almost surely, 2^649690016 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 649690016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703080000).

649690016 is an abundant number, since it is smaller than the sum of its proper divisors (756469984).

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

649690016 is a wasteful number, since it uses less digits than its factorization.

649690016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 649690016 is about 25489.0175565870. The cubic root of 649690016 is about 866.1013807461.

The spelling of 649690016 in words is "six hundred forty-nine million, six hundred ninety thousand, sixteen".