66031040 has 28 divisors (see below), whose sum is σ = 157237176. Its totient is φ = 26412288.

The previous prime is 66031039. The next prime is 66031079. The reversal of 66031040 is 4013066.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 102854 + ... + 103493.

Almost surely, 2^66031040 is an apocalyptic number.

It is an amenable number.

66031040 is an abundant number, since it is smaller than the sum of its proper divisors (91206136).

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

66031040 is a wasteful number, since it uses less digits than its factorization.

66031040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206364 (or 206354 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 66031040 is about 8125.9485600144. The cubic root of 66031040 is about 404.1873457139.

The spelling of 66031040 in words is "sixty-six million, thirty-one thousand, forty".