3649451520 has 320 divisors, whose sum is σ = 13710622464. Its totient is φ = 816414720.

The previous prime is 3649451513. The next prime is 3649451537. The reversal of 3649451520 is 251549463.

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1096579 + ... + 1099901.

Almost surely, 2^3649451520 is an apocalyptic number.

3649451520 is a gapful number since it is divisible by the number (30) 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 3649451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6855311232).

3649451520 is an abundant number, since it is smaller than the sum of its proper divisors (10061170944).

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

3649451520 is a wasteful number, since it uses less digits than its factorization.

3649451520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373 (or 3357 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 3649451520 is about 60410.6904446556. The cubic root of 3649451520 is about 1539.6045985496.

The spelling of 3649451520 in words is "three billion, six hundred forty-nine million, four hundred fifty-one thousand, five hundred twenty".