647400651 has 4 divisors (see below), whose sum is σ = 863200872. Its totient is φ = 431600432.

The previous prime is 647400631. The next prime is 647400653. The reversal of 647400651 is 156004746.

647400651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 647400651 - 2¹⁴ = 647384267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647400653) 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, 107900106 + ... + 107900111.

It is an arithmetic number, because the mean of its divisors is an integer number (215800218).

Almost surely, 2^647400651 is an apocalyptic number.

647400651 is a deficient number, since it is larger than the sum of its proper divisors (215800221).

647400651 is a wasteful number, since it uses less digits than its factorization.

647400651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215800220.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 647400651 is about 25444.0690731652. The cubic root of 647400651 is about 865.0828664194.

The spelling of 647400651 in words is "six hundred forty-seven million, four hundred thousand, six hundred fifty-one".