647383380 has 48 divisors (see below), whose sum is σ = 2071628160. Its totient is φ = 147973248.

The previous prime is 647383379. The next prime is 647383381. The reversal of 647383380 is 83383746.

It is an interprime number because it is at equal distance from previous prime (647383379) and next prime (647383381).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647383381) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 770275 + ... + 771114.

It is an arithmetic number, because the mean of its divisors is an integer number (43158920).

Almost surely, 2^647383380 is an apocalyptic number.

647383380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647383380 is an abundant number, since it is smaller than the sum of its proper divisors (1424244780).

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

647383380 is a wasteful number, since it uses less digits than its factorization.

647383380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541408 (or 1541406 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 647383380 is about 25443.7296794318. The cubic root of 647383380 is about 865.0751736154.

The spelling of 647383380 in words is "six hundred forty-seven million, three hundred eighty-three thousand, three hundred eighty".