649199520 has 144 divisors (see below), whose sum is σ = 2287014912. Its totient is φ = 167523840.

The previous prime is 649199503. The next prime is 649199561. The reversal of 649199520 is 25991946.

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

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37369 + ... + 51911.

It is an arithmetic number, because the mean of its divisors is an integer number (15882048).

Almost surely, 2^649199520 is an apocalyptic number.

649199520 is a gapful number since it is divisible by the number (60) 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 649199520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1143507456).

649199520 is an abundant number, since it is smaller than the sum of its proper divisors (1637815392).

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

649199520 is a wasteful number, since it uses less digits than its factorization.

649199520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14595 (or 14584 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 649199520 is about 25479.3940273312. The cubic root of 649199520 is about 865.8833658951.

The spelling of 649199520 in words is "six hundred forty-nine million, one hundred ninety-nine thousand, five hundred twenty".