1621713320 has 32 divisors (see below), whose sum is σ = 3653094600. Its totient is φ = 647931648.

The previous prime is 1621713299. The next prime is 1621713347. The reversal of 1621713320 is 233171261.

It can be written as a sum of positive squares in 4 ways, for example, as 1602721156 + 18992164 = 40034^2 + 4358^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1621713320.

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, 11966 + ... + 58194.

Almost surely, 2^1621713320 is an apocalyptic number.

1621713320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1621713320 is an abundant number, since it is smaller than the sum of its proper divisors (2031381280).

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

1621713320 is a wasteful number, since it uses less digits than its factorization.

1621713320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47117 (or 47113 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1621713320 is about 40270.5018593014. The cubic root of 1621713320 is about 1174.8741848084.

Adding to 1621713320 its reverse (233171261), we get a palindrome (1854884581).

The spelling of 1621713320 in words is "one billion, six hundred twenty-one million, seven hundred thirteen thousand, three hundred twenty".