645774754 has 8 divisors (see below), whose sum is σ = 975077568. Its totient is φ = 320748900.

The previous prime is 645774713. The next prime is 645774757. The reversal of 645774754 is 457477546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 645774698 and 645774707.

It is not an unprimeable number, because it can be changed into a prime (645774757) 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, 1068862 + ... + 1069465.

It is an arithmetic number, because the mean of its divisors is an integer number (121884696).

Almost surely, 2^645774754 is an apocalyptic number.

645774754 is a deficient number, since it is larger than the sum of its proper divisors (329302814).

645774754 is a wasteful number, since it uses less digits than its factorization.

645774754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138480.

The product of its digits is 3292800, while the sum is 49.

The square root of 645774754 is about 25412.0985752850. The cubic root of 645774754 is about 864.3580629305.

The spelling of 645774754 in words is "six hundred forty-five million, seven hundred seventy-four thousand, seven hundred fifty-four".