1649332428 has 48 divisors (see below), whose sum is σ = 3987416160. Its totient is φ = 529984000.

The previous prime is 1649332393. The next prime is 1649332441. The reversal of 1649332428 is 8242339461.

It is a self number, because there is not a number n which added to its sum of digits gives 1649332428.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240568 + ... + 247328.

It is an arithmetic number, because the mean of its divisors is an integer number (83071170).

Almost surely, 2^1649332428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1649332428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1993708080).

1649332428 is an abundant number, since it is smaller than the sum of its proper divisors (2338083732).

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

1649332428 is a wasteful number, since it uses less digits than its factorization.

1649332428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7498 (or 7496 counting only the distinct ones).

The product of its digits is 248832, while the sum is 42.

The square root of 1649332428 is about 40611.9739485783. The cubic root of 1649332428 is about 1181.5063659466.

The spelling of 1649332428 in words is "one billion, six hundred forty-nine million, three hundred thirty-two thousand, four hundred twenty-eight".