647948258 has 4 divisors (see below), whose sum is σ = 971922390. Its totient is φ = 323974128.

The previous prime is 647948239. The next prime is 647948261. The reversal of 647948258 is 852849746.

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

It can be written as a sum of positive squares in only one way, i.e., 424236409 + 223711849 = 20597^2 + 14957^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161987063 + ... + 161987066.

Almost surely, 2^647948258 is an apocalyptic number.

647948258 is a deficient number, since it is larger than the sum of its proper divisors (323974132).

647948258 is a wasteful number, since it uses less digits than its factorization.

647948258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323974131.

The product of its digits is 3870720, while the sum is 53.

The square root of 647948258 is about 25454.8277935640. The cubic root of 647948258 is about 865.3267092019.

The spelling of 647948258 in words is "six hundred forty-seven million, nine hundred forty-eight thousand, two hundred fifty-eight".