647428715 has 8 divisors (see below), whose sum is σ = 778241520. Its totient is φ = 517058272.

The previous prime is 647428711. The next prime is 647428723. The reversal of 647428715 is 517824746.

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

It is a cyclic number.

It is not a de Polignac number, because 647428715 - 2² = 647428711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647428711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107360 + ... + 113229.

It is an arithmetic number, because the mean of its divisors is an integer number (97280190).

Almost surely, 2^647428715 is an apocalyptic number.

647428715 is a deficient number, since it is larger than the sum of its proper divisors (130812805).

647428715 is a wasteful number, since it uses less digits than its factorization.

647428715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221181.

The product of its digits is 376320, while the sum is 44.

The square root of 647428715 is about 25444.6205513071. The cubic root of 647428715 is about 865.0953663218.

The spelling of 647428715 in words is "six hundred forty-seven million, four hundred twenty-eight thousand, seven hundred fifteen".