647724984 has 32 divisors (see below), whose sum is σ = 1627714320. Its totient is φ = 214788096.

The previous prime is 647724983. The next prime is 647724989. The reversal of 647724984 is 489427746.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647724983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65287 + ... + 74550.

Almost surely, 2^647724984 is an apocalyptic number.

It is an amenable number.

647724984 is an abundant number, since it is smaller than the sum of its proper divisors (979989336).

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

647724984 is a wasteful number, since it uses less digits than its factorization.

647724984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140039 (or 140035 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 51.

The square root of 647724984 is about 25450.4417250467. The cubic root of 647724984 is about 865.2273045815.

The spelling of 647724984 in words is "six hundred forty-seven million, seven hundred twenty-four thousand, nine hundred eighty-four".