647774013 has 4 divisors (see below), whose sum is σ = 863698688. Its totient is φ = 431849340.

The previous prime is 647773999. The next prime is 647774053. The reversal of 647774013 is 310477746.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 647774013 - 2⁹ = 647773501 is a prime.

It is a super-2 number, since 2×647774013² = 839222343836248338, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647774053) 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, 107962333 + ... + 107962338.

It is an arithmetic number, because the mean of its divisors is an integer number (215924672).

Almost surely, 2^647774013 is an apocalyptic number.

It is an amenable number.

647774013 is a deficient number, since it is larger than the sum of its proper divisors (215924675).

647774013 is a wasteful number, since it uses less digits than its factorization.

647774013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215924674.

The product of its (nonzero) digits is 98784, while the sum is 39.

The square root of 647774013 is about 25451.4049317518. The cubic root of 647774013 is about 865.2491349160.

The spelling of 647774013 in words is "six hundred forty-seven million, seven hundred seventy-four thousand, thirteen".