1640123450 has 48 divisors (see below), whose sum is σ = 3691531584. Its totient is φ = 529248000.

The previous prime is 1640123431. The next prime is 1640123473. The reversal of 1640123450 is 543210461.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 131876 + ... + 143775.

It is an arithmetic number, because the mean of its divisors is an integer number (76906908).

Almost surely, 2^1640123450 is an apocalyptic number.

1640123450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640123450 is an abundant number, since it is smaller than the sum of its proper divisors (2051408134).

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

1640123450 is a wasteful number, since it uses less digits than its factorization.

1640123450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275687 (or 275682 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1640123450 is about 40498.4376241850. The cubic root of 1640123450 is about 1179.3032969548.

The spelling of 1640123450 in words is "one billion, six hundred forty million, one hundred twenty-three thousand, four hundred fifty".