1640704032 has 96 divisors (see below), whose sum is σ = 5220452160. Its totient is φ = 497180160.

The previous prime is 1640704031. The next prime is 1640704033. The reversal of 1640704032 is 2304070461.

It is an interprime number because it is at equal distance from previous prime (1640704031) and next prime (1640704033).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1640703987 and 1640704005.

It is not an unprimeable number, because it can be changed into a prime (1640704031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76813 + ... + 95820.

It is an arithmetic number, because the mean of its divisors is an integer number (54379710).

Almost surely, 2^1640704032 is an apocalyptic number.

1640704032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1640704032 is an abundant number, since it is smaller than the sum of its proper divisors (3579748128).

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

1640704032 is a wasteful number, since it uses less digits than its factorization.

1640704032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172663 (or 172649 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 1640704032 is about 40505.6049454887. The cubic root of 1640704032 is about 1179.4424331263.

Adding to 1640704032 its reverse (2304070461), we get a palindrome (3944774493).

The spelling of 1640704032 in words is "one billion, six hundred forty million, seven hundred four thousand, thirty-two".