648722 has 4 divisors (see below), whose sum is σ = 973086. Its totient is φ = 324360.

The previous prime is 648719. The next prime is 648731. The reversal of 648722 is 227846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 519841 + 128881 = 721^2 + 359^2 .

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162179 + ... + 162182.

2⁶⁴⁸⁷²² is an apocalyptic number.

648722 is a deficient number, since it is larger than the sum of its proper divisors (324364).

648722 is a wasteful number, since it uses less digits than its factorization.

648722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324363.

The product of its digits is 5376, while the sum is 29.

The square root of 648722 is about 805.4328029079. The cubic root of 648722 is about 86.5671013076.

Subtracting from 648722 its product of digits (5376), we obtain a palindrome (643346).

It can be divided in two parts, 648 and 722, that multiplied together give a square (467856 = 684²).

The spelling of 648722 in words is "six hundred forty-eight thousand, seven hundred twenty-two".