1649243520 has 384 divisors, whose sum is σ = 6072019200. Its totient is φ = 411586560.

The previous prime is 1649243509. The next prime is 1649243549. The reversal of 1649243520 is 253429461.

It is a happy number.

1649243520 is a `hidden beast` number, since 1 + 6 + 4 + 92 + 43 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 7816215 + ... + 7816425.

It is an arithmetic number, because the mean of its divisors is an integer number (15812550).

Almost surely, 2^1649243520 is an apocalyptic number.

1649243520 is a gapful number since it is divisible by the number (10) 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 1649243520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3036009600).

1649243520 is an abundant number, since it is smaller than the sum of its proper divisors (4422775680).

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

1649243520 is a wasteful number, since it uses less digits than its factorization.

1649243520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 303 counting only the distinct ones).

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

The square root of 1649243520 is about 40610.8793305439. The cubic root of 1649243520 is about 1181.4851356893.

The spelling of 1649243520 in words is "one billion, six hundred forty-nine million, two hundred forty-three thousand, five hundred twenty".