1621308416 has 176 divisors, whose sum is σ = 4049719296. Its totient is φ = 631701504.

The previous prime is 1621308407. The next prime is 1621308427. The reversal of 1621308416 is 6148031261.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11834300 + ... + 11834436.

Almost surely, 2^1621308416 is an apocalyptic number.

1621308416 is a gapful number since it is divisible by the number (16) 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 1621308416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2024859648).

1621308416 is an abundant number, since it is smaller than the sum of its proper divisors (2428410880).

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

1621308416 is a wasteful number, since it uses less digits than its factorization.

1621308416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1621308416 is about 40265.4742428299. The cubic root of 1621308416 is about 1174.7763971069.

Adding to 1621308416 its reverse (6148031261), we get a palindrome (7769339677).

The spelling of 1621308416 in words is "one billion, six hundred twenty-one million, three hundred eight thousand, four hundred sixteen".