648993569 has 16 divisors (see below), whose sum is σ = 759158400. Its totient is φ = 543314304.

The previous prime is 648993559. The next prime is 648993571. The reversal of 648993569 is 965399846.

It is a cyclic number.

It is not a de Polignac number, because 648993569 - 2⁸ = 648993313 is a prime.

It is a super-2 number, since 2×648993569² = 842385305206715522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is not an unprimeable number, because it can be changed into a prime (648993559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59837 + ... + 69845.

It is an arithmetic number, because the mean of its divisors is an integer number (47447400).

Almost surely, 2^648993569 is an apocalyptic number.

It is an amenable number.

648993569 is a deficient number, since it is larger than the sum of its proper divisors (110164831).

648993569 is a wasteful number, since it uses less digits than its factorization.

648993569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10232.

The product of its digits is 12597120, while the sum is 59.

The square root of 648993569 is about 25475.3521859856. The cubic root of 648993569 is about 865.7917924006.

The spelling of 648993569 in words is "six hundred forty-eight million, nine hundred ninety-three thousand, five hundred sixty-nine".