649817828 has 24 divisors (see below), whose sum is σ = 1274093184. Its totient is φ = 287388000.

The previous prime is 649817807. The next prime is 649817837. The reversal of 649817828 is 828718946.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 649817828.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197948 + ... + 201203.

It is an arithmetic number, because the mean of its divisors is an integer number (53087216).

Almost surely, 2^649817828 is an apocalyptic number.

It is an amenable number.

649817828 is a deficient number, since it is larger than the sum of its proper divisors (624275356).

649817828 is a wasteful number, since it uses less digits than its factorization.

649817828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399203 (or 399201 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 53.

The square root of 649817828 is about 25491.5246307474. The cubic root of 649817828 is about 866.1581723897.

The spelling of 649817828 in words is "six hundred forty-nine million, eight hundred seventeen thousand, eight hundred twenty-eight".