66770872 has 16 divisors (see below), whose sum is σ = 143080560. Its totient is φ = 28616064.

The previous prime is 66770861. The next prime is 66770881. The reversal of 66770872 is 27807766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 596113 + ... + 596224.

It is an arithmetic number, because the mean of its divisors is an integer number (8942535).

Almost surely, 2^66770872 is an apocalyptic number.

It is an amenable number.

66770872 is an abundant number, since it is smaller than the sum of its proper divisors (76309688).

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

66770872 is a wasteful number, since it uses less digits than its factorization.

66770872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192350 (or 1192346 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 43.

The square root of 66770872 is about 8171.3445650028. The cubic root of 66770872 is about 405.6912890206.

The spelling of 66770872 in words is "sixty-six million, seven hundred seventy thousand, eight hundred seventy-two".