648445574 has 16 divisors (see below), whose sum is σ = 1115202816. Its totient is φ = 277009800.

The previous prime is 648445571. The next prime is 648445691. The reversal of 648445574 is 475544846.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648445571) 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, 70112 + ... + 78819.

It is an arithmetic number, because the mean of its divisors is an integer number (69700176).

Almost surely, 2^648445574 is an apocalyptic number.

648445574 is a deficient number, since it is larger than the sum of its proper divisors (466757242).

648445574 is a wasteful number, since it uses less digits than its factorization.

648445574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149251.

The product of its digits is 2150400, while the sum is 47.

The square root of 648445574 is about 25464.5945186645. The cubic root of 648445574 is about 865.5480389970.

The spelling of 648445574 in words is "six hundred forty-eight million, four hundred forty-five thousand, five hundred seventy-four".