1620528 has 120 divisors (see below), whose sum is σ = 5343408. Its totient is φ = 419328.

The previous prime is 1620523. The next prime is 1620539. The reversal of 1620528 is 8250261.

It is a Cunningham number, because it is equal to 1273²-1.

It is a super-2 number, since 2×1620528² = 5252221997568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 1620498 and 1620507.

It is not an unprimeable number, because it can be changed into a prime (1620523) 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, 30550 + ... + 30602.

2^1620528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2671704).

1620528 is an abundant number, since it is smaller than the sum of its proper divisors (3722880).

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

1620528 is a wasteful number, since it uses less digits than its factorization.

1620528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1620528 is about 1272.9996072270. Note that the first 3 decimals coincide. The cubic root of 1620528 is about 117.4587874177.

Adding to 1620528 its reverse (8250261), we get a palindrome (9870789).

The spelling of 1620528 in words is "one million, six hundred twenty thousand, five hundred twenty-eight".