648699374 has 4 divisors (see below), whose sum is σ = 973049064. Its totient is φ = 324349686.

The previous prime is 648699367. The next prime is 648699391. The reversal of 648699374 is 473996846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 473996846 = 2 ⋅236998423.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162174842 + ... + 162174845.

It is an arithmetic number, because the mean of its divisors is an integer number (243262266).

Almost surely, 2^648699374 is an apocalyptic number.

648699374 is a deficient number, since it is larger than the sum of its proper divisors (324349690).

648699374 is a wasteful number, since it uses less digits than its factorization.

648699374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324349689.

The product of its digits is 7838208, while the sum is 56.

The square root of 648699374 is about 25469.5774209153. The cubic root of 648699374 is about 865.6609487241.

The spelling of 648699374 in words is "six hundred forty-eight million, six hundred ninety-nine thousand, three hundred seventy-four".