1622561540 has 12 divisors (see below), whose sum is σ = 3407379276. Its totient is φ = 649024608.

The previous prime is 1622561497. The next prime is 1622561561. The reversal of 1622561540 is 451652261.

It can be written as a sum of positive squares in 2 ways, for example, as 273174784 + 1349386756 = 16528^2 + 36734^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1622561497 and 1622561506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40564019 + ... + 40564058.

It is an arithmetic number, because the mean of its divisors is an integer number (283948273).

Almost surely, 2^1622561540 is an apocalyptic number.

1622561540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1622561540 is an abundant number, since it is smaller than the sum of its proper divisors (1784817736).

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

1622561540 is a wasteful number, since it uses less digits than its factorization.

1622561540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81128086 (or 81128084 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1622561540 is about 40281.0320125987. The cubic root of 1622561540 is about 1175.0789842786.

The spelling of 1622561540 in words is "one billion, six hundred twenty-two million, five hundred sixty-one thousand, five hundred forty".