647942988 has 96 divisors (see below), whose sum is σ = 1890459648. Its totient is φ = 167803200.

The previous prime is 647942983. The next prime is 647943013. The reversal of 647942988 is 889249746.

It is not an unprimeable number, because it can be changed into a prime (647942983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 397431 + ... + 399057.

It is an arithmetic number, because the mean of its divisors is an integer number (19692288).

Almost surely, 2^647942988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647942988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945229824).

647942988 is an abundant number, since it is smaller than the sum of its proper divisors (1242516660).

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

647942988 is a wasteful number, since it uses less digits than its factorization.

647942988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083 (or 2081 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 57.

The square root of 647942988 is about 25454.7242766446. The cubic root of 647942988 is about 865.3243631894.

The spelling of 647942988 in words is "six hundred forty-seven million, nine hundred forty-two thousand, nine hundred eighty-eight".