1622138220 has 72 divisors (see below), whose sum is σ = 4931690400. Its totient is φ = 431585280.

The previous prime is 1622138197. The next prime is 1622138233. The reversal of 1622138220 is 228312261.

1622138220 is a `hidden beast` number, since 1 + 622 + 1 + 38 + 2 + 2 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70785 + ... + 90855.

It is an arithmetic number, because the mean of its divisors is an integer number (68495700).

Almost surely, 2^1622138220 is an apocalyptic number.

1622138220 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 1622138220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2465845200).

1622138220 is an abundant number, since it is smaller than the sum of its proper divisors (3309552180).

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

1622138220 is a wasteful number, since it uses less digits than its factorization.

1622138220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20535 (or 20530 counting only the distinct ones).

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

The square root of 1622138220 is about 40275.7770874753. Note that the first 3 decimals coincide. The cubic root of 1622138220 is about 1174.9767842101.

The spelling of 1622138220 in words is "one billion, six hundred twenty-two million, one hundred thirty-eight thousand, two hundred twenty".