649278693 has 64 divisors (see below), whose sum is σ = 1126912000. Its totient is φ = 361817280.

The previous prime is 649278689. The next prime is 649278719. The reversal of 649278693 is 396872946.

It is a happy number.

It is not a de Polignac number, because 649278693 - 2² = 649278689 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 (649278653) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2294130 + ... + 2294412.

It is an arithmetic number, because the mean of its divisors is an integer number (17608000).

Almost surely, 2^649278693 is an apocalyptic number.

649278693 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

649278693 is a deficient number, since it is larger than the sum of its proper divisors (477633307).

649278693 is a wasteful number, since it uses less digits than its factorization.

649278693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 553 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 649278693 is about 25480.9476472128. The cubic root of 649278693 is about 865.9185640096.

The spelling of 649278693 in words is "six hundred forty-nine million, two hundred seventy-eight thousand, six hundred ninety-three".