545490 has 96 divisors (see below), whose sum is σ = 1684800. Its totient is φ = 120960.

The previous prime is 545483. The next prime is 545497. The reversal of 545490 is 94545.

545490 is a nontrivial binomial coefficient, being equal to C(1045, 2).

It is an interprime number because it is at equal distance from previous prime (545483) and next prime (545497).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (545497) by changing a digit.

545490 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18796 + ... + 18824.

It is an arithmetic number, because the mean of its divisors is an integer number (17550).

2⁵⁴⁵⁴⁹⁰ is an apocalyptic number.

545490 is the 1044-th triangular number.

It is a practical number, because each smaller number is the sum of distinct divisors of 545490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (842400).

545490 is an abundant number, since it is smaller than the sum of its proper divisors (1139310).

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

545490 is a wasteful number, since it uses less digits than its factorization.

545490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 545490 is about 738.5729483267. The cubic root of 545490 is about 81.7075643182.

It can be divided in two parts, 545 and 490, that added together give a triangular number (1035 = T₄₅).

The spelling of 545490 in words is "five hundred forty-five thousand, four hundred ninety".