66677440 has 28 divisors (see below), whose sum is σ = 158776416. Its totient is φ = 26670848.

The previous prime is 66677431. The next prime is 66677459. The reversal of 66677440 is 4477666.

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

It is a junction number, because it is equal to n+sod(n) for n = 66677393 and 66677402.

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, 103864 + ... + 104503.

Almost surely, 2^66677440 is an apocalyptic number.

It is an amenable number.

66677440 is an abundant number, since it is smaller than the sum of its proper divisors (92098976).

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

66677440 is a wasteful number, since it uses less digits than its factorization.

66677440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208384 (or 208374 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 66677440 is about 8165.6255118637. The cubic root of 66677440 is about 405.5019737250.

The spelling of 66677440 in words is "sixty-six million, six hundred seventy-seven thousand, four hundred forty".