645167742 has 16 divisors (see below), whose sum is σ = 1325209872. Its totient is φ = 209243520.

The previous prime is 645167741. The next prime is 645167777. The reversal of 645167742 is 247761546.

It is a junction number, because it is equal to n+sod(n) for n = 645167694 and 645167703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645167741) 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, 1452859 + ... + 1453302.

It is an arithmetic number, because the mean of its divisors is an integer number (82825617).

Almost surely, 2^645167742 is an apocalyptic number.

645167742 is an abundant number, since it is smaller than the sum of its proper divisors (680042130).

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

645167742 is a wasteful number, since it uses less digits than its factorization.

645167742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906203.

The product of its digits is 282240, while the sum is 42.

The square root of 645167742 is about 25400.1524011176. The cubic root of 645167742 is about 864.0871530954.

The spelling of 645167742 in words is "six hundred forty-five million, one hundred sixty-seven thousand, seven hundred forty-two".