648731619 has 16 divisors (see below), whose sum is σ = 987060640. Its totient is φ = 420798240.

The previous prime is 648731617. The next prime is 648731623. The reversal of 648731619 is 916137846.

It is a happy number.

648731619 is a `hidden beast` number, since 6 + 487 + 3 + 161 + 9 = 666.

It is not a de Polignac number, because 648731619 - 2¹ = 648731617 is a prime.

It is a super-2 number, since 2×648731619² = 841705426980722322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648731617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323692 + ... + 325689.

It is an arithmetic number, because the mean of its divisors is an integer number (61691290).

Almost surely, 2^648731619 is an apocalyptic number.

648731619 is a deficient number, since it is larger than the sum of its proper divisors (338329021).

648731619 is a wasteful number, since it uses less digits than its factorization.

648731619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649427 (or 649421 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 648731619 is about 25470.2104231591. The cubic root of 648731619 is about 865.6752916672.

The spelling of 648731619 in words is "six hundred forty-eight million, seven hundred thirty-one thousand, six hundred nineteen".