648445831 has 32 divisors (see below), whose sum is σ = 772996608. Its totient is φ = 537863040.

The previous prime is 648445823. The next prime is 648445849. The reversal of 648445831 is 138544846.

It is not a de Polignac number, because 648445831 - 2³ = 648445823 is a prime.

It is a super-2 number, since 2×648445831² = 840963991482561122, 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 (648445531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 495480 + ... + 496786.

It is an arithmetic number, because the mean of its divisors is an integer number (24156144).

Almost surely, 2^648445831 is an apocalyptic number.

648445831 is a deficient number, since it is larger than the sum of its proper divisors (124550777).

648445831 is a wasteful number, since it uses less digits than its factorization.

648445831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431.

The product of its digits is 368640, while the sum is 43.

The square root of 648445831 is about 25464.5995648862. The cubic root of 648445831 is about 865.5481533452.

The spelling of 648445831 in words is "six hundred forty-eight million, four hundred forty-five thousand, eight hundred thirty-one".