1624428 has 72 divisors (see below), whose sum is σ = 4611600. Its totient is φ = 494208.

The previous prime is 1624423. The next prime is 1624429. The reversal of 1624428 is 8244261.

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

Its product of digits (3072) is a multiple of the sum of its prime factors (128).

It is not an unprimeable number, because it can be changed into a prime (1624423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18208 + ... + 18296.

It is an arithmetic number, because the mean of its divisors is an integer number (64050).

2^1624428 is an apocalyptic number.

1624428 is a gapful number since it is divisible by the number (18) 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 1624428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2305800).

1624428 is an abundant number, since it is smaller than the sum of its proper divisors (2987172).

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

1624428 is a wasteful number, since it uses less digits than its factorization.

1624428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 107 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 1624428 is about 1274.5305017927. The cubic root of 1624428 is about 117.5529382703.

Adding to 1624428 its reverse (8244261), we get a palindrome (9868689).

The spelling of 1624428 in words is "one million, six hundred twenty-four thousand, four hundred twenty-eight".