54561780 has 144 divisors (see below), whose sum is σ = 203758464. Its totient is φ = 11508480.

The previous prime is 54561779. The next prime is 54561781. The reversal of 54561780 is 8716545.

It is an interprime number because it is at equal distance from previous prime (54561779) and next prime (54561781).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54561781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14715 + ... + 18045.

Almost surely, 2^54561780 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 54561780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101879232).

54561780 is an abundant number, since it is smaller than the sum of its proper divisors (149196684).

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

54561780 is a wasteful number, since it uses less digits than its factorization.

54561780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366 (or 3361 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 54561780 is about 7386.5946145704. The cubic root of 54561780 is about 379.2825335760.

The spelling of 54561780 in words is "fifty-four million, five hundred sixty-one thousand, seven hundred eighty".