1649782590 has 16 divisors (see below), whose sum is σ = 3959478288. Its totient is φ = 439942016.

The previous prime is 1649782567. The next prime is 1649782619. The reversal of 1649782590 is 952879461.

It is a congruent number.

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, 27496347 + ... + 27496406.

It is an arithmetic number, because the mean of its divisors is an integer number (247467393).

Almost surely, 2^1649782590 is an apocalyptic number.

1649782590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1649782590 is an abundant number, since it is smaller than the sum of its proper divisors (2309695698).

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

1649782590 is a wasteful number, since it uses less digits than its factorization.

1649782590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54992763.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The square root of 1649782590 is about 40617.5158029144. The cubic root of 1649782590 is about 1181.6138479957.

The spelling of 1649782590 in words is "one billion, six hundred forty-nine million, seven hundred eighty-two thousand, five hundred ninety".