647454720 has 224 divisors, whose sum is σ = 2264785920. Its totient is φ = 156631040.

The previous prime is 647454719. The next prime is 647454733. The reversal of 647454720 is 27454746.

It is a super-2 number, since 2×647454720² = 838395228900556800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1351441 + ... + 1351919.

Almost surely, 2^647454720 is an apocalyptic number.

647454720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647454720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1132392960).

647454720 is an abundant number, since it is smaller than the sum of its proper divisors (1617331200).

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

647454720 is a wasteful number, since it uses less digits than its factorization.

647454720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 39.

The square root of 647454720 is about 25445.1315579228. The cubic root of 647454720 is about 865.1069488086.

The spelling of 647454720 in words is "six hundred forty-seven million, four hundred fifty-four thousand, seven hundred twenty".