649729850 has 48 divisors (see below), whose sum is σ = 1506707136. Its totient is φ = 202512000.

The previous prime is 649729831. The next prime is 649729859. The reversal of 649729850 is 58927946.

It is a happy number.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649729859) 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, 80531 + ... + 88230.

It is an arithmetic number, because the mean of its divisors is an integer number (31389732).

Almost surely, 2^649729850 is an apocalyptic number.

649729850 is an abundant number, since it is smaller than the sum of its proper divisors (856977286).

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

649729850 is a wasteful number, since it uses less digits than its factorization.

649729850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168791 (or 168786 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 649729850 is about 25489.7989399681. The cubic root of 649729850 is about 866.1190812784.

The spelling of 649729850 in words is "six hundred forty-nine million, seven hundred twenty-nine thousand, eight hundred fifty".