647280372 has 96 divisors (see below), whose sum is σ = 1737953280. Its totient is φ = 186140160.

The previous prime is 647280349. The next prime is 647280383. The reversal of 647280372 is 273082746.

It is a self number, because there is not a number n which added to its sum of digits gives 647280372.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117463 + ... + 122849.

It is an arithmetic number, because the mean of its divisors is an integer number (18103680).

Almost surely, 2^647280372 is an apocalyptic number.

647280372 is a gapful number since it is divisible by the number (62) 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 647280372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (868976640).

647280372 is an abundant number, since it is smaller than the sum of its proper divisors (1090672908).

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

647280372 is a wasteful number, since it uses less digits than its factorization.

647280372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461 (or 5459 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 39.

The square root of 647280372 is about 25441.7053673688. The cubic root of 647280372 is about 865.0292892173.

The spelling of 647280372 in words is "six hundred forty-seven million, two hundred eighty thousand, three hundred seventy-two".