66761240 has 64 divisors (see below), whose sum is σ = 184887360. Its totient is φ = 21127680.

The previous prime is 66761237. The next prime is 66761263. The reversal of 66761240 is 4216766.

It is a junction number, because it is equal to n+sod(n) for n = 66761197 and 66761206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5531 + ... + 12810.

It is an arithmetic number, because the mean of its divisors is an integer number (2888865).

Almost surely, 2^66761240 is an apocalyptic number.

It is an amenable number.

66761240 is an abundant number, since it is smaller than the sum of its proper divisors (118126120).

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

66761240 is a wasteful number, since it uses less digits than its factorization.

66761240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18372 (or 18368 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 66761240 is about 8170.7551670577. The cubic root of 66761240 is about 405.6717804820.

The spelling of 66761240 in words is "sixty-six million, seven hundred sixty-one thousand, two hundred forty".