1561028 has 24 divisors (see below), whose sum is σ = 3148992. Its totient is φ = 663264.

The previous prime is 1561019. The next prime is 1561037. The reversal of 1561028 is 8201651.

It is an interprime number because it is at equal distance from previous prime (1561019) and next prime (1561037).

It is a junction number, because it is equal to n+sod(n) for n = 1560994 and 1561012.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5375 + ... + 5657.

It is an arithmetic number, because the mean of its divisors is an integer number (131208).

2^1561028 is an apocalyptic number.

It is an amenable number.

1561028 is an abundant number, since it is smaller than the sum of its proper divisors (1587964).

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

1561028 is a wasteful number, since it uses less digits than its factorization.

1561028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1561028 is about 1249.4110612605. The cubic root of 1561028 is about 116.0032698246.

Adding to 1561028 its reverse (8201651), we get a palindrome (9762679).

The spelling of 1561028 in words is "one million, five hundred sixty-one thousand, twenty-eight".