648769731 has 4 divisors (see below), whose sum is σ = 865026312. Its totient is φ = 432513152.

The previous prime is 648769727. The next prime is 648769739. The reversal of 648769731 is 137967846.

648769731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 648769731 - 2² = 648769727 is a prime.

It is a super-2 number, since 2×648769731² = 841804327723624722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (648769739) 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, 108128286 + ... + 108128291.

It is an arithmetic number, because the mean of its divisors is an integer number (216256578).

Almost surely, 2^648769731 is an apocalyptic number.

648769731 is a deficient number, since it is larger than the sum of its proper divisors (216256581).

648769731 is a wasteful number, since it uses less digits than its factorization.

648769731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216256580.

The product of its digits is 1524096, while the sum is 51.

The square root of 648769731 is about 25470.9585803126. The cubic root of 648769731 is about 865.6922437060.

The spelling of 648769731 in words is "six hundred forty-eight million, seven hundred sixty-nine thousand, seven hundred thirty-one".