648723631 has 8 divisors (see below), whose sum is σ = 684452720. Its totient is φ = 613153152.

The previous prime is 648723623. The next prime is 648723641. The reversal of 648723631 is 136327846.

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

It is a cyclic number.

It is not a de Polignac number, because 648723631 - 2³ = 648723623 is a prime.

It is a super-2 number, since 2×648723631² = 841684698835648322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648723611) 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, 31200 + ... + 47653.

It is an arithmetic number, because the mean of its divisors is an integer number (85556590).

Almost surely, 2^648723631 is an apocalyptic number.

648723631 is a deficient number, since it is larger than the sum of its proper divisors (35729089).

648723631 is a wasteful number, since it uses less digits than its factorization.

648723631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79305.

The product of its digits is 145152, while the sum is 40.

The square root of 648723631 is about 25470.0536120362. The cubic root of 648723631 is about 865.6717385582.

The spelling of 648723631 in words is "six hundred forty-eight million, seven hundred twenty-three thousand, six hundred thirty-one".