1621618080 has 192 divisors, whose sum is σ = 5405097600. Its totient is φ = 407531520.

The previous prime is 1621618073. The next prime is 1621618081. The reversal of 1621618080 is 808161261.

It is not an unprimeable number, because it can be changed into a prime (1621618081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2452950 + ... + 2453610.

It is an arithmetic number, because the mean of its divisors is an integer number (28151550).

Almost surely, 2^1621618080 is an apocalyptic number.

1621618080 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 1621618080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2702548800).

1621618080 is an abundant number, since it is smaller than the sum of its proper divisors (3783479520).

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

1621618080 is a wasteful number, since it uses less digits than its factorization.

1621618080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 1621618080 is about 40269.3193386727. The cubic root of 1621618080 is about 1174.8511850162.

The spelling of 1621618080 in words is "one billion, six hundred twenty-one million, six hundred eighteen thousand, eighty".