647433623 has 2 divisors, whose sum is σ = 647433624. Its totient is φ = 647433622.

The previous prime is 647433599. The next prime is 647433649. The reversal of 647433623 is 326334746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647433623 - 2¹² = 647429527 is a prime.

It is a super-2 number, since 2×647433623² = 838340592381812258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647433653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323716811 + 323716812.

It is an arithmetic number, because the mean of its divisors is an integer number (323716812).

Almost surely, 2^647433623 is an apocalyptic number.

647433623 is a deficient number, since it is larger than the sum of its proper divisors (1).

647433623 is an equidigital number, since it uses as much as digits as its factorization.

647433623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 38.

The square root of 647433623 is about 25444.7169958717. The cubic root of 647433623 is about 865.0975523423.

The spelling of 647433623 in words is "six hundred forty-seven million, four hundred thirty-three thousand, six hundred twenty-three".