647121474 has 40 divisors (see below), whose sum is σ = 1480900608. Its totient is φ = 211115160.

The previous prime is 647121463. The next prime is 647121481. The reversal of 647121474 is 474121746.

It is a happy number.

647121474 is a `hidden beast` number, since 64 + 7 + 121 + 474 = 666.

It is a super-2 number, since 2×647121474² = 837532404223865352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34882 + ... + 50109.

Almost surely, 2^647121474 is an apocalyptic number.

647121474 is an abundant number, since it is smaller than the sum of its proper divisors (833779134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647121474 is a wasteful number, since it uses less digits than its factorization.

647121474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85052 (or 85043 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 647121474 is about 25438.5823897481. The cubic root of 647121474 is about 864.9584993510.

The spelling of 647121474 in words is "six hundred forty-seven million, one hundred twenty-one thousand, four hundred seventy-four".