745321621 has 8 divisors (see below), whose sum is σ = 813276000. Its totient is φ = 677400240.

The previous prime is 745321613. The next prime is 745321631. The reversal of 745321621 is 126123547.

745321621 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 745321621 - 2³ = 745321613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745321631) 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, 81330 + ... + 90028.

It is an arithmetic number, because the mean of its divisors is an integer number (101659500).

Almost surely, 2^745321621 is an apocalyptic number.

It is an amenable number.

745321621 is a deficient number, since it is larger than the sum of its proper divisors (67954379).

745321621 is a wasteful number, since it uses less digits than its factorization.

745321621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16499.

The product of its digits is 10080, while the sum is 31.

The square root of 745321621 is about 27300.5791330514. The cubic root of 745321621 is about 906.6672038245.

The spelling of 745321621 in words is "seven hundred forty-five million, three hundred twenty-one thousand, six hundred twenty-one".