647420788 has 24 divisors (see below), whose sum is σ = 1299779712. Its totient is φ = 276407904.

The previous prime is 647420749. The next prime is 647420789. The reversal of 647420788 is 887024746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647420789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36595 + ... + 51322.

It is an arithmetic number, because the mean of its divisors is an integer number (54157488).

Almost surely, 2^647420788 is an apocalyptic number.

It is an amenable number.

647420788 is an abundant number, since it is smaller than the sum of its proper divisors (652358924).

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

647420788 is a wasteful number, since it uses less digits than its factorization.

647420788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88191 (or 88189 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 46.

The square root of 647420788 is about 25444.4647811661. The cubic root of 647420788 is about 865.0918356170.

The spelling of 647420788 in words is "six hundred forty-seven million, four hundred twenty thousand, seven hundred eighty-eight".