647770613 has 4 divisors (see below), whose sum is σ = 740309280. Its totient is φ = 555231948.

The previous prime is 647770573. The next prime is 647770621. The reversal of 647770613 is 316077746.

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 a cyclic number.

It is not a de Polignac number, because 647770613 - 2¹² = 647766517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647770663) 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, 46269323 + ... + 46269336.

It is an arithmetic number, because the mean of its divisors is an integer number (185077320).

Almost surely, 2^647770613 is an apocalyptic number.

It is an amenable number.

647770613 is a deficient number, since it is larger than the sum of its proper divisors (92538667).

647770613 is an equidigital number, since it uses as much as digits as its factorization.

647770613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92538666.

The product of its (nonzero) digits is 148176, while the sum is 41.

The square root of 647770613 is about 25451.3381377090. The cubic root of 647770613 is about 865.2476210896.

The spelling of 647770613 in words is "six hundred forty-seven million, seven hundred seventy thousand, six hundred thirteen".