1649478020 has 24 divisors (see below), whose sum is σ = 3464693568. Its totient is φ = 659640800.

The previous prime is 1649478013. The next prime is 1649478043. The reversal of 1649478020 is 208749461.

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, 133505 + ... + 145335.

It is an arithmetic number, because the mean of its divisors is an integer number (144362232).

Almost surely, 2^1649478020 is an apocalyptic number.

1649478020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649478020 is an abundant number, since it is smaller than the sum of its proper divisors (1815215548).

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

1649478020 is a wasteful number, since it uses less digits than its factorization.

1649478020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18811 (or 18809 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 1649478020 is about 40613.7663853034. The cubic root of 1649478020 is about 1181.5411300751.

The spelling of 1649478020 in words is "one billion, six hundred forty-nine million, four hundred seventy-eight thousand, twenty".