647427690 has 288 divisors, whose sum is σ = 2204931456. Its totient is φ = 130394880.

The previous prime is 647427637. The next prime is 647427691. The reversal of 647427690 is 96724746.

It is a super-2 number, since 2×647427690² = 838325227557472200, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (647427691) 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 143 ways as a sum of consecutive naturals, for example, 1318345 + ... + 1318835.

It is an arithmetic number, because the mean of its divisors is an integer number (7656012).

Almost surely, 2^647427690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647427690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1102465728).

647427690 is an abundant number, since it is smaller than the sum of its proper divisors (1557503766).

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

647427690 is a wasteful number, since it uses less digits than its factorization.

647427690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The square root of 647427690 is about 25444.6004095171. The cubic root of 647427690 is about 865.0949097859.

The spelling of 647427690 in words is "six hundred forty-seven million, four hundred twenty-seven thousand, six hundred ninety".