647742378 has 8 divisors (see below), whose sum is σ = 1295484768. Its totient is φ = 215914124.

The previous prime is 647742371. The next prime is 647742401. The reversal of 647742378 is 873247746.

It is a sphenic number, since it is the product of 3 distinct primes.

647742378 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (647742371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53978526 + ... + 53978537.

It is an arithmetic number, because the mean of its divisors is an integer number (161935596).

Almost surely, 2^647742378 is an apocalyptic number.

647742378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

647742378 is a wasteful number, since it uses less digits than its factorization.

647742378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107957068.

The product of its digits is 1580544, while the sum is 48.

The square root of 647742378 is about 25450.7834457016. The cubic root of 647742378 is about 865.2350494472.

The spelling of 647742378 in words is "six hundred forty-seven million, seven hundred forty-two thousand, three hundred seventy-eight".