1620423408 has 160 divisors (see below), whose sum is σ = 4556922624. Its totient is φ = 494309376.

The previous prime is 1620423407. The next prime is 1620423433. The reversal of 1620423408 is 8043240261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620423407) 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, 5849766 + ... + 5850042.

Almost surely, 2^1620423408 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 1620423408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2278461312).

1620423408 is an abundant number, since it is smaller than the sum of its proper divisors (2936499216).

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

1620423408 is a wasteful number, since it uses less digits than its factorization.

1620423408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 473 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 1620423408 is about 40254.4830795279. The cubic root of 1620423408 is about 1174.5626035784.

Adding to 1620423408 its reverse (8043240261), we get a palindrome (9663663669).

The spelling of 1620423408 in words is "one billion, six hundred twenty million, four hundred twenty-three thousand, four hundred eight".