649944427 has 8 divisors (see below), whose sum is σ = 712212480. Its totient is φ = 588206760.

The previous prime is 649944397. The next prime is 649944439. The reversal of 649944427 is 724449946.

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 649944427 - 2²⁷ = 515726699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649948427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130027 + ... + 134932.

It is an arithmetic number, because the mean of its divisors is an integer number (89026560).

Almost surely, 2^649944427 is an apocalyptic number.

649944427 is a deficient number, since it is larger than the sum of its proper divisors (62268053).

649944427 is a wasteful number, since it uses less digits than its factorization.

649944427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265193.

The product of its digits is 1741824, while the sum is 49.

The square root of 649944427 is about 25494.0076684699. The cubic root of 649944427 is about 866.2144177113.

The spelling of 649944427 in words is "six hundred forty-nine million, nine hundred forty-four thousand, four hundred twenty-seven".