647294420 has 18 divisors (see below), whose sum is σ = 1359557262. Its totient is φ = 258872256.

The previous prime is 647294411. The next prime is 647294423. The reversal of 647294420 is 24492746.

It can be written as a sum of positive squares in 3 ways, for example, as 393784336 + 253510084 = 19844^2 + 15922^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647294423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110936 + ... + 116624.

It is an arithmetic number, because the mean of its divisors is an integer number (75530959).

Almost surely, 2^647294420 is an apocalyptic number.

It is an amenable number.

647294420 is an abundant number, since it is smaller than the sum of its proper divisors (712262842).

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

647294420 is an frugal number, since it uses more digits than its factorization.

647294420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11387 (or 5696 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 647294420 is about 25441.9814479926. The cubic root of 647294420 is about 865.0355471152.

The spelling of 647294420 in words is "six hundred forty-seven million, two hundred ninety-four thousand, four hundred twenty".