648390628 has 6 divisors (see below), whose sum is σ = 1134683606. Its totient is φ = 324195312.

The previous prime is 648390623. The next prime is 648390629. The reversal of 648390628 is 826093846.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 574465024 + 73925604 = 23968^2 + 8598^2 .

It is not an unprimeable number, because it can be changed into a prime (648390623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81048825 + ... + 81048832.

Almost surely, 2^648390628 is an apocalyptic number.

It is an amenable number.

648390628 is a deficient number, since it is larger than the sum of its proper divisors (486292978).

648390628 is a wasteful number, since it uses less digits than its factorization.

648390628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162097661 (or 162097659 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 648390628 is about 25463.5156253020. The cubic root of 648390628 is about 865.5235909180.

The spelling of 648390628 in words is "six hundred forty-eight million, three hundred ninety thousand, six hundred twenty-eight".