1640446980 has 48 divisors (see below), whose sum is σ = 4599591360. Its totient is φ = 436848768.

The previous prime is 1640446957. The next prime is 1640446987. The reversal of 1640446980 is 896440461.

It is a super-2 number, since 2×1640446980² = 5382132588382240800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1640446987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25842 + ... + 62838.

It is an arithmetic number, because the mean of its divisors is an integer number (95824820).

Almost surely, 2^1640446980 is an apocalyptic number.

1640446980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640446980 is an abundant number, since it is smaller than the sum of its proper divisors (2959144380).

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

1640446980 is a wasteful number, since it uses less digits than its factorization.

1640446980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37748 (or 37746 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 1640446980 is about 40502.4317788451. The cubic root of 1640446980 is about 1179.3808347992.

The spelling of 1640446980 in words is "one billion, six hundred forty million, four hundred forty-six thousand, nine hundred eighty".