1620369408 has 112 divisors (see below), whose sum is σ = 4938491520. Its totient is φ = 462913536.

The previous prime is 1620369391. The next prime is 1620369427. The reversal of 1620369408 is 8049630261.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167323 + ... + 176741.

Almost surely, 2^1620369408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620369408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2469245760).

1620369408 is an abundant number, since it is smaller than the sum of its proper divisors (3318122112).

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

1620369408 is an frugal number, since it uses more digits than its factorization.

1620369408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9455 (or 9431 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 1620369408 is about 40253.8123411932. The cubic root of 1620369408 is about 1174.5495561479.

Adding to 1620369408 its reverse (8049630261), we get a palindrome (9669999669).

The spelling of 1620369408 in words is "one billion, six hundred twenty million, three hundred sixty-nine thousand, four hundred eight".