66906760 has 32 divisors (see below), whose sum is σ = 150773400. Its totient is φ = 26721280.

The previous prime is 66906739. The next prime is 66906797. The reversal of 66906760 is 6760966.

It can be written as a sum of positive squares in 4 ways, for example, as 60746436 + 6160324 = 7794^2 + 2482^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 48480 + ... + 49840.

Almost surely, 2^66906760 is an apocalyptic number.

It is an amenable number.

66906760 is an abundant number, since it is smaller than the sum of its proper divisors (83866640).

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

66906760 is a wasteful number, since it uses less digits than its factorization.

66906760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601 (or 2597 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 66906760 is about 8179.6552494589. The cubic root of 66906760 is about 405.9663152427.

The spelling of 66906760 in words is "sixty-six million, nine hundred six thousand, seven hundred sixty".