1621262344 has 64 divisors (see below), whose sum is σ = 3364583040. Its totient is φ = 727626240.

The previous prime is 1621262311. The next prime is 1621262347. The reversal of 1621262344 is 4432621261.

It is not an unprimeable number, because it can be changed into a prime (1621262347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2229709 + ... + 2230435.

It is an arithmetic number, because the mean of its divisors is an integer number (52571610).

Almost surely, 2^1621262344 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 1621262344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1682291520).

1621262344 is an abundant number, since it is smaller than the sum of its proper divisors (1743320696).

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

1621262344 is a wasteful number, since it uses less digits than its factorization.

1621262344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310 (or 1306 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 1621262344 is about 40264.9021357311. The cubic root of 1621262344 is about 1174.7652693021.

The spelling of 1621262344 in words is "one billion, six hundred twenty-one million, two hundred sixty-two thousand, three hundred forty-four".