745624421 has 4 divisors (see below), whose sum is σ = 745706700. Its totient is φ = 745542144.

The previous prime is 745624417. The next prime is 745624433. The reversal of 745624421 is 124426547.

It is a happy number.

745624421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 192904321 + 552720100 = 13889^2 + 23510^2 .

It is a cyclic number.

It is not a de Polignac number, because 745624421 - 2² = 745624417 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 (745624021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25586 + ... + 46323.

It is an arithmetic number, because the mean of its divisors is an integer number (186426675).

Almost surely, 2^745624421 is an apocalyptic number.

It is an amenable number.

745624421 is a deficient number, since it is larger than the sum of its proper divisors (82279).

745624421 is a wasteful number, since it uses less digits than its factorization.

745624421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82278.

The product of its digits is 53760, while the sum is 35.

The square root of 745624421 is about 27306.1242398111. The cubic root of 745624421 is about 906.7899703597.

The spelling of 745624421 in words is "seven hundred forty-five million, six hundred twenty-four thousand, four hundred twenty-one".