649949472 has 144 divisors (see below), whose sum is σ = 1953439488. Its totient is φ = 204664320.

The previous prime is 649949431. The next prime is 649949477. The reversal of 649949472 is 274949946.

649949472 is a `hidden beast` number, since 64 + 99 + 494 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is not an unprimeable number, because it can be changed into a prime (649949477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 383058 + ... + 384750.

It is an arithmetic number, because the mean of its divisors is an integer number (13565552).

Almost surely, 2^649949472 is an apocalyptic number.

649949472 is a gapful number since it is divisible by the number (62) 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 649949472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976719744).

649949472 is an abundant number, since it is smaller than the sum of its proper divisors (1303490016).

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

649949472 is a wasteful number, since it uses less digits than its factorization.

649949472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783 (or 1772 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 649949472 is about 25494.1066130979. The cubic root of 649949472 is about 866.2166589493.

The spelling of 649949472 in words is "six hundred forty-nine million, nine hundred forty-nine thousand, four hundred seventy-two".