1649881420 has 48 divisors (see below), whose sum is σ = 3860172288. Its totient is φ = 587188160.

The previous prime is 1649881403. The next prime is 1649881423. The reversal of 1649881420 is 241889461.

It is a super-2 number, since 2×1649881420² = 5444217400122432800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1649881423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69442 + ... + 90121.

It is an arithmetic number, because the mean of its divisors is an integer number (80420256).

Almost surely, 2^1649881420 is an apocalyptic number.

1649881420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649881420 is an abundant number, since it is smaller than the sum of its proper divisors (2210290868).

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

1649881420 is a wasteful number, since it uses less digits than its factorization.

1649881420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159630 (or 159628 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 1649881420 is about 40618.7323780543. The cubic root of 1649881420 is about 1181.6374423298.

The spelling of 1649881420 in words is "one billion, six hundred forty-nine million, eight hundred eighty-one thousand, four hundred twenty".