645437742 has 64 divisors (see below), whose sum is σ = 1395118080. Its totient is φ = 198342144.

The previous prime is 645437729. The next prime is 645437789. The reversal of 645437742 is 247734546.

645437742 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 645437694 and 645437703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1393803 + ... + 1394265.

It is an arithmetic number, because the mean of its divisors is an integer number (21798720).

Almost surely, 2^645437742 is an apocalyptic number.

645437742 is an abundant number, since it is smaller than the sum of its proper divisors (749680338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645437742 is a wasteful number, since it uses less digits than its factorization.

645437742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737.

The product of its digits is 564480, while the sum is 42.

The square root of 645437742 is about 25405.4667739052. The cubic root of 645437742 is about 864.2076752368.

The spelling of 645437742 in words is "six hundred forty-five million, four hundred thirty-seven thousand, seven hundred forty-two".