1616640 has 72 divisors (see below), whose sum is σ = 5175408. Its totient is φ = 430080.

The previous prime is 1616639. The next prime is 1616651. The reversal of 1616640 is 466161.

It is a super-2 number, since 2×1616640² = 5227049779200, which contains 22 as substring.

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

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1616640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3630 + ... + 4050.

2^1616640 is an apocalyptic number.

1616640 is a gapful number since it is divisible by the number (10) 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 1616640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2587704).

1616640 is an abundant number, since it is smaller than the sum of its proper divisors (3558768).

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

1616640 is an equidigital number, since it uses as much as digits as its factorization.

1616640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1616640 is about 1271.4715883574. The cubic root of 1616640 is about 117.3647757791.

The spelling of 1616640 in words is "one million, six hundred sixteen thousand, six hundred forty".