647260378 has 4 divisors (see below), whose sum is σ = 970890570. Its totient is φ = 323630188.

The previous prime is 647260373. The next prime is 647260409. The reversal of 647260378 is 873062746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 613701529 + 33558849 = 24773^2 + 5793^2 .

It is not an unprimeable number, because it can be changed into a prime (647260373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161815093 + ... + 161815096.

Almost surely, 2^647260378 is an apocalyptic number.

647260378 is a deficient number, since it is larger than the sum of its proper divisors (323630192).

647260378 is a wasteful number, since it uses less digits than its factorization.

647260378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323630191.

The product of its (nonzero) digits is 338688, while the sum is 43.

The square root of 647260378 is about 25441.3124268384. The cubic root of 647260378 is about 865.0203824259.

The spelling of 647260378 in words is "six hundred forty-seven million, two hundred sixty thousand, three hundred seventy-eight".