1640621112 has 64 divisors (see below), whose sum is σ = 4445323680. Its totient is φ = 501576192.

The previous prime is 1640621111. The next prime is 1640621149. The reversal of 1640621112 is 2111260461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640621111) 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, 32238 + ... + 65730.

Almost surely, 2^1640621112 is an apocalyptic number.

1640621112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640621112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2222661840).

1640621112 is an abundant number, since it is smaller than the sum of its proper divisors (2804702568).

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

1640621112 is a wasteful number, since it uses less digits than its factorization.

1640621112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33672 (or 33668 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1640621112 is about 40504.5813705067. The cubic root of 1640621112 is about 1179.4225634012.

Adding to 1640621112 its reverse (2111260461), we get a palindrome (3751881573).

The spelling of 1640621112 in words is "one billion, six hundred forty million, six hundred twenty-one thousand, one hundred twelve".