66057240 has 64 divisors (see below), whose sum is σ = 209835360. Its totient is φ = 16578560.

The previous prime is 66057221. The next prime is 66057241. The reversal of 66057240 is 4275066.

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 = 66057198 and 66057207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66057241) 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, 14151 + ... + 18230.

Almost surely, 2^66057240 is an apocalyptic number.

66057240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66057240 is an abundant number, since it is smaller than the sum of its proper divisors (143778120).

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

66057240 is a wasteful number, since it uses less digits than its factorization.

66057240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32412 (or 32408 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 66057240 is about 8127.5605196147. The cubic root of 66057240 is about 404.2407968795.

The spelling of 66057240 in words is "sixty-six million, fifty-seven thousand, two hundred forty".