647426880 has 168 divisors, whose sum is σ = 2274734592. Its totient is φ = 168938496.

The previous prime is 647426863. The next prime is 647426887. The reversal of 647426880 is 88624746.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647426887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132969 + ... + 137751.

Almost surely, 2^647426880 is an apocalyptic number.

647426880 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 647426880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1137367296).

647426880 is an abundant number, since it is smaller than the sum of its proper divisors (1627307712).

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

647426880 is a wasteful number, since it uses less digits than its factorization.

647426880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4853 (or 4840 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The square root of 647426880 is about 25444.5844925792. The cubic root of 647426880 is about 865.0945490109.

The spelling of 647426880 in words is "six hundred forty-seven million, four hundred twenty-six thousand, eight hundred eighty".