649709540 has 24 divisors (see below), whose sum is σ = 1365326592. Its totient is φ = 259705440.

The previous prime is 649709539. The next prime is 649709573. The reversal of 649709540 is 45907946.

It is a junction number, because it is equal to n+sod(n) for n = 649709491 and 649709500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20975 + ... + 41705.

It is an arithmetic number, because the mean of its divisors is an integer number (56888608).

Almost surely, 2^649709540 is an apocalyptic number.

It is an amenable number.

649709540 is an abundant number, since it is smaller than the sum of its proper divisors (715617052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649709540 is a wasteful number, since it uses less digits than its factorization.

649709540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22307 (or 22305 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 649709540 is about 25489.4005421862. The cubic root of 649709540 is about 866.1100564702.

The spelling of 649709540 in words is "six hundred forty-nine million, seven hundred nine thousand, five hundred forty".