745800821 has 8 divisors (see below), whose sum is σ = 770214144. Its totient is φ = 721409760.

The previous prime is 745800817. The next prime is 745800833. The reversal of 745800821 is 128008547.

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 745800821 - 2² = 745800817 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 (745800871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87470 + ... + 95616.

It is an arithmetic number, because the mean of its divisors is an integer number (96276768).

Almost surely, 2^745800821 is an apocalyptic number.

It is an amenable number.

745800821 is a deficient number, since it is larger than the sum of its proper divisors (24413323).

745800821 is a wasteful number, since it uses less digits than its factorization.

745800821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11131.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 745800821 is about 27309.3540934237. The cubic root of 745800821 is about 906.8614742490.

The spelling of 745800821 in words is "seven hundred forty-five million, eight hundred thousand, eight hundred twenty-one".