647142534 has 96 divisors (see below), whose sum is σ = 1501403904. Its totient is φ = 208824480.

The previous prime is 647142523. The next prime is 647142557. The reversal of 647142534 is 435241746.

647142534 is a `hidden beast` number, since 647 + 1 + 4 + 2 + 5 + 3 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2460487 + ... + 2460749.

It is an arithmetic number, because the mean of its divisors is an integer number (15639624).

Almost surely, 2^647142534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647142534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (750701952).

647142534 is an abundant number, since it is smaller than the sum of its proper divisors (854261370).

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

647142534 is a wasteful number, since it uses less digits than its factorization.

647142534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 412 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 647142534 is about 25438.9963245408. The cubic root of 647142534 is about 864.9678823541.

The spelling of 647142534 in words is "six hundred forty-seven million, one hundred forty-two thousand, five hundred thirty-four".