647274505 has 4 divisors (see below), whose sum is σ = 776729412. Its totient is φ = 517819600.

The previous prime is 647274497. The next prime is 647274517. The reversal of 647274505 is 505472746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 504137209 + 143137296 = 22453^2 + 11964^2 .

It is not a de Polignac number, because 647274505 - 2³ = 647274497 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64727446 + ... + 64727455.

It is an arithmetic number, because the mean of its divisors is an integer number (194182353).

Almost surely, 2^647274505 is an apocalyptic number.

It is an amenable number.

647274505 is a deficient number, since it is larger than the sum of its proper divisors (129454907).

647274505 is a wasteful number, since it uses less digits than its factorization.

647274505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129454906.

The product of its (nonzero) digits is 235200, while the sum is 40.

The square root of 647274505 is about 25441.5900643022. The cubic root of 647274505 is about 865.0266756450.

The spelling of 647274505 in words is "six hundred forty-seven million, two hundred seventy-four thousand, five hundred five".