66870420 has 24 divisors (see below), whose sum is σ = 187237344. Its totient is φ = 17832096.

The previous prime is 66870403. The next prime is 66870421. The reversal of 66870420 is 2407866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66870421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557194 + ... + 557313.

It is an arithmetic number, because the mean of its divisors is an integer number (7801556).

Almost surely, 2^66870420 is an apocalyptic number.

66870420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66870420 is an abundant number, since it is smaller than the sum of its proper divisors (120366924).

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

66870420 is a wasteful number, since it uses less digits than its factorization.

66870420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114519 (or 1114517 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 66870420 is about 8177.4335827324. The cubic root of 66870420 is about 405.8928025529.

The spelling of 66870420 in words is "sixty-six million, eight hundred seventy thousand, four hundred twenty".