744416621 has 8 divisors (see below), whose sum is σ = 848837304. Its totient is φ = 646732800.

The previous prime is 744416567. The next prime is 744416627. The reversal of 744416621 is 126614447.

It can be written as a sum of positive squares in 4 ways, for example, as 46717225 + 697699396 = 6835^2 + 26414^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 744416621 - 2⁶ = 744416557 is a prime.

It is a super-2 number, since 2×744416621² = 1108312211242115282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744416627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1683980 + ... + 1684421.

It is an arithmetic number, because the mean of its divisors is an integer number (106104663).

Almost surely, 2^744416621 is an apocalyptic number.

It is an amenable number.

744416621 is a deficient number, since it is larger than the sum of its proper divisors (104420683).

744416621 is a wasteful number, since it uses less digits than its factorization.

744416621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368431.

The product of its digits is 32256, while the sum is 35.

The square root of 744416621 is about 27283.9993585984. Note that the first 3 decimals coincide. The cubic root of 744416621 is about 906.3000843917.

Adding to 744416621 its sum of digits (35), we get a square (744416656 = 27284²).

The spelling of 744416621 in words is "seven hundred forty-four million, four hundred sixteen thousand, six hundred twenty-one".