745305621 has 8 divisors (see below), whose sum is σ = 993870240. Its totient is φ = 496805712.

The previous prime is 745305607. The next prime is 745305637. The reversal of 745305621 is 126503547.

745305621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 745305621 - 2¹⁰ = 745304597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745301621) 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, 27711 + ... + 47523.

It is an arithmetic number, because the mean of its divisors is an integer number (124233780).

Almost surely, 2^745305621 is an apocalyptic number.

It is an amenable number.

745305621 is a deficient number, since it is larger than the sum of its proper divisors (248564619).

745305621 is a wasteful number, since it uses less digits than its factorization.

745305621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32355.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 745305621 is about 27300.2860974020. The cubic root of 745305621 is about 906.6607158965.

The spelling of 745305621 in words is "seven hundred forty-five million, three hundred five thousand, six hundred twenty-one".