64649250 has 96 divisors (see below), whose sum is σ = 178139520. Its totient is φ = 16912800.

The previous prime is 64649243. The next prime is 64649287. The reversal of 64649250 is 5294646.

64649250 is a `hidden beast` number, since 6 + 4 + 649 + 2 + 5 + 0 = 666.

64649250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132507 + ... + 132993.

It is an arithmetic number, because the mean of its divisors is an integer number (1855620).

Almost surely, 2^64649250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64649250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89069760).

64649250 is an abundant number, since it is smaller than the sum of its proper divisors (113490270).

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

64649250 is a wasteful number, since it uses less digits than its factorization.

64649250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 64649250 is about 8040.4757321940. The cubic root of 64649250 is about 401.3480559260.

The spelling of 64649250 in words is "sixty-four million, six hundred forty-nine thousand, two hundred fifty".