647508623 has 2 divisors, whose sum is σ = 647508624. Its totient is φ = 647508622.

The previous prime is 647508559. The next prime is 647508637. The reversal of 647508623 is 326805746.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647508623 - 2⁶ = 647508559 is a prime.

It is a super-2 number, since 2×647508623² = 838534833718712258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647508643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323754311 + 323754312.

It is an arithmetic number, because the mean of its divisors is an integer number (323754312).

Almost surely, 2^647508623 is an apocalyptic number.

647508623 is a deficient number, since it is larger than the sum of its proper divisors (1).

647508623 is an equidigital number, since it uses as much as digits as its factorization.

647508623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 647508623 is about 25446.1907365326. The cubic root of 647508623 is about 865.1309559268.

The spelling of 647508623 in words is "six hundred forty-seven million, five hundred eight thousand, six hundred twenty-three".