647478090 has 256 divisors, whose sum is σ = 2092400640. Its totient is φ = 139345920.

The previous prime is 647478089. The next prime is 647478101. The reversal of 647478090 is 90874746.

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

It is an unprimeable number.

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 127 ways as a sum of consecutive naturals, for example, 2519242 + ... + 2519498.

It is an arithmetic number, because the mean of its divisors is an integer number (8173440).

Almost surely, 2^647478090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647478090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046200320).

647478090 is an abundant number, since it is smaller than the sum of its proper divisors (1444922550).

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

647478090 is a wasteful number, since it uses less digits than its factorization.

647478090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 647478090 is about 25445.5907771857. The cubic root of 647478090 is about 865.1173574161.

The spelling of 647478090 in words is "six hundred forty-seven million, four hundred seventy-eight thousand, ninety".