647123530 has 16 divisors (see below), whose sum is σ = 1233341640. Its totient is φ = 243622912.

The previous prime is 647123501. The next prime is 647123531. The reversal of 647123530 is 35321746.

It can be written as a sum of positive squares in 4 ways, for example, as 593555769 + 53567761 = 24363^2 + 7319^2 .

It is a junction number, because it is equal to n+sod(n) for n = 647123492 and 647123501.

It is not an unprimeable number, because it can be changed into a prime (647123531) 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, 1903135 + ... + 1903474.

Almost surely, 2^647123530 is an apocalyptic number.

647123530 is a deficient number, since it is larger than the sum of its proper divisors (586218110).

647123530 is a wasteful number, since it uses less digits than its factorization.

647123530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806633.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 647123530 is about 25438.6228007728. The cubic root of 647123530 is about 864.9594153834.

The spelling of 647123530 in words is "six hundred forty-seven million, one hundred twenty-three thousand, five hundred thirty".