1641646980 has 48 divisors (see below), whose sum is σ = 5107347840. Its totient is φ = 437772384.

The previous prime is 1641646967. The next prime is 1641647003. The reversal of 1641646980 is 896461461.

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

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, 1519504 + ... + 1520583.

It is an arithmetic number, because the mean of its divisors is an integer number (106403080).

Almost surely, 2^1641646980 is an apocalyptic number.

1641646980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641646980 is an abundant number, since it is smaller than the sum of its proper divisors (3465700860).

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

1641646980 is a wasteful number, since it uses less digits than its factorization.

1641646980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3040105 (or 3040097 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1641646980 is about 40517.2429960381. The cubic root of 1641646980 is about 1179.6683401903.

The spelling of 1641646980 in words is "one billion, six hundred forty-one million, six hundred forty-six thousand, nine hundred eighty".