1621244160 has 360 divisors, whose sum is σ = 6113849280. Its totient is φ = 409079808.

The previous prime is 1621244147. The next prime is 1621244237. The reversal of 1621244160 is 614421261.

1621244160 is a `hidden beast` number, since 1 + 6 + 212 + 441 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1969509 + ... + 1970331.

Almost surely, 2^1621244160 is an apocalyptic number.

1621244160 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 1621244160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3056924640).

1621244160 is an abundant number, since it is smaller than the sum of its proper divisors (4492605120).

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

1621244160 is an equidigital number, since it uses as much as digits as its factorization.

1621244160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875 (or 852 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1621244160 is about 40264.6763305009. The cubic root of 1621244160 is about 1174.7608772489.

The spelling of 1621244160 in words is "one billion, six hundred twenty-one million, two hundred forty-four thousand, one hundred sixty".