1640574120 has 64 divisors (see below), whose sum is σ = 5211241920. Its totient is φ = 411751424.

The previous prime is 1640574101. The next prime is 1640574121. The reversal of 1640574120 is 214750461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1640574121) 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, 400062 + ... + 404141.

It is an arithmetic number, because the mean of its divisors is an integer number (81425655).

Almost surely, 2^1640574120 is an apocalyptic number.

1640574120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640574120 is an abundant number, since it is smaller than the sum of its proper divisors (3570667800).

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

1640574120 is a wasteful number, since it uses less digits than its factorization.

1640574120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804234 (or 804230 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1640574120 is about 40504.0012838238. The cubic root of 1640574120 is about 1179.4113026346.

It can be divided in two parts, 16405 and 74120, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 1640574120 in words is "one billion, six hundred forty million, five hundred seventy-four thousand, one hundred twenty".