654780 has 48 divisors (see below), whose sum is σ = 2096640. Its totient is φ = 149568.

The previous prime is 654779. The next prime is 654781. The reversal of 654780 is 87456.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (654779) and next prime (654781).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 654780.

It is not an unprimeable number, because it can be changed into a prime (654781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 360 + ... + 1199.

It is an arithmetic number, because the mean of its divisors is an integer number (43680).

2⁶⁵⁴⁷⁸⁰ is an apocalyptic number.

654780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

654780 is an abundant number, since it is smaller than the sum of its proper divisors (1441860).

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

654780 is a wasteful number, since it uses less digits than its factorization.

654780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578 (or 1576 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 654780 is about 809.1847749433. The cubic root of 654780 is about 86.8357317830.

The spelling of 654780 in words is "six hundred fifty-four thousand, seven hundred eighty".