66807638 has 16 divisors (see below), whose sum is σ = 102857040. Its totient is φ = 32526816.

The previous prime is 66807623. The next prime is 66807641. The reversal of 66807638 is 83670866.

It is a congruent number.

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, 32456 + ... + 34452.

It is an arithmetic number, because the mean of its divisors is an integer number (6428565).

Almost surely, 2^66807638 is an apocalyptic number.

66807638 is a deficient number, since it is larger than the sum of its proper divisors (36049402).

66807638 is a wasteful number, since it uses less digits than its factorization.

66807638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 66807638 is about 8173.5939463617. The cubic root of 66807638 is about 405.7657371977.

The spelling of 66807638 in words is "sixty-six million, eight hundred seven thousand, six hundred thirty-eight".