647633407 has 2 divisors, whose sum is σ = 647633408. Its totient is φ = 647633406.

The previous prime is 647633359. The next prime is 647633453. The reversal of 647633407 is 704336746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647633407 - 2¹⁹ = 647109119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647633407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647633507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323816703 + 323816704.

It is an arithmetic number, because the mean of its divisors is an integer number (323816704).

Almost surely, 2^647633407 is an apocalyptic number.

647633407 is a deficient number, since it is larger than the sum of its proper divisors (1).

647633407 is an equidigital number, since it uses as much as digits as its factorization.

647633407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 40.

The square root of 647633407 is about 25448.6425374714. The cubic root of 647633407 is about 865.1865266499.

The spelling of 647633407 in words is "six hundred forty-seven million, six hundred thirty-three thousand, four hundred seven".