1642181880 has 64 divisors (see below), whose sum is σ = 5031383040. Its totient is φ = 428596352.

The previous prime is 1642181867. The next prime is 1642181881. The reversal of 1642181880 is 881812461.

1642181880 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1642181880² = 5393522654000668800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642181881) 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, 139944 + ... + 151223.

It is an arithmetic number, because the mean of its divisors is an integer number (78615360).

Almost surely, 2^1642181880 is an apocalyptic number.

1642181880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642181880 is an abundant number, since it is smaller than the sum of its proper divisors (3389201160).

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

1642181880 is a wasteful number, since it uses less digits than its factorization.

1642181880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291228 (or 291224 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 39.

The square root of 1642181880 is about 40523.8433517849. The cubic root of 1642181880 is about 1179.7964505740.

The spelling of 1642181880 in words is "one billion, six hundred forty-two million, one hundred eighty-one thousand, eight hundred eighty".