66255240 has 32 divisors (see below), whose sum is σ = 198766080. Its totient is φ = 17668032.

The previous prime is 66255199. The next prime is 66255253. The reversal of 66255240 is 4255266.

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

It is a junction number, because it is equal to n+sod(n) for n = 66255198 and 66255207.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275944 + ... + 276183.

It is an arithmetic number, because the mean of its divisors is an integer number (6211440).

Almost surely, 2^66255240 is an apocalyptic number.

66255240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66255240 is an abundant number, since it is smaller than the sum of its proper divisors (132510840).

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

66255240 is a wasteful number, since it uses less digits than its factorization.

66255240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552141 (or 552137 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 66255240 is about 8139.7321823264. The cubic root of 66255240 is about 404.6442845233.

The spelling of 66255240 in words is "sixty-six million, two hundred fifty-five thousand, two hundred forty".