655740 has 36 divisors (see below), whose sum is σ = 1989624. Its totient is φ = 174816.

The previous prime is 655727. The next prime is 655757. The reversal of 655740 is 47556.

655740 is a `hidden beast` number, since 655 + 7 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1642 + ... + 2001.

2⁶⁵⁵⁷⁴⁰ is an apocalyptic number.

655740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655740 is an abundant number, since it is smaller than the sum of its proper divisors (1333884).

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

655740 is a wasteful number, since it uses less digits than its factorization.

655740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3658 (or 3653 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 655740 is about 809.7777472863. Note that the first 4 decimals coincide. The cubic root of 655740 is about 86.8781488775.

The spelling of 655740 in words is "six hundred fifty-five thousand, seven hundred forty".