1649444670 has 48 divisors (see below), whose sum is σ = 4294369872. Its totient is φ = 439255680.

The previous prime is 1649444639. The next prime is 1649444677. The reversal of 1649444670 is 764449461.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649444677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56449 + ... + 80531.

It is an arithmetic number, because the mean of its divisors is an integer number (89466039).

Almost surely, 2^1649444670 is an apocalyptic number.

1649444670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1649444670 is an abundant number, since it is smaller than the sum of its proper divisors (2644925202).

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

1649444670 is a wasteful number, since it uses less digits than its factorization.

1649444670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24857 (or 24854 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 1649444670 is about 40613.3558081575. The cubic root of 1649444670 is about 1181.5331670182.

The spelling of 1649444670 in words is "one billion, six hundred forty-nine million, four hundred forty-four thousand, six hundred seventy".