637428745 has 4 divisors (see below), whose sum is σ = 764914500. Its totient is φ = 509942992.

The previous prime is 637428733. The next prime is 637428809. The reversal of 637428745 is 547824736.

637428745 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.

It can be written as a sum of positive squares in 2 ways, for example, as 211295296 + 426133449 = 14536^2 + 20643^2 .

It is a cyclic number.

It is not a de Polignac number, because 637428745 - 2²⁷ = 503211017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 637428695 and 637428704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63742870 + ... + 63742879.

It is an arithmetic number, because the mean of its divisors is an integer number (191228625).

Almost surely, 2^637428745 is an apocalyptic number.

It is an amenable number.

637428745 is a deficient number, since it is larger than the sum of its proper divisors (127485755).

637428745 is a wasteful number, since it uses less digits than its factorization.

637428745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127485754.

The product of its digits is 1128960, while the sum is 46.

The square root of 637428745 is about 25247.3512472101. The cubic root of 637428745 is about 860.6182434754.

The spelling of 637428745 in words is "six hundred thirty-seven million, four hundred twenty-eight thousand, seven hundred forty-five".